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Recovery of grasslands in former croplands using the combination of seed sowing and hay transfer
5-11Views:54In accordance with general trends in agricultural and natureőconservation practice in Europe, grassland restoration and traditional grassland management has gained increased importance in Hungary. In grassland restoration using of low rates of seed (less than 30kg/ha) and hay cover is suggested. In the present paper the effect of hay cover combined with low rate of seed (25 kg/ha) is studied in early grassland recovery. We aimed at to answer the question whether or not the speed of grassland recovery can be increased with a combined use of seed sowing and hay cover. The establishment of Festuca species was favoured by hay cover combined whit seed sowing. The emergence of shortlived weeds was significantly lower on most of the fields treated with hay cover and seed sowing. The species richness and diversity of early weeds did not differ significantly in fields sown only and fields treated both with seed sowing and hay cover. Our results suggest that the combination of seed sowing and hay cover is successful in fields, where high rate of weed invasion is possible, thus intensive post-restoration management is necessary.
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Az avar rövid életű keresztesvirágú (Brassicaceae) gyomfajok csírázásra gyakorolt hatása
3-8Views:41Recruitment by seeds is essential both in vegetation dynamics and in supporting grassland biodiversity. Recruitment by seeds is feasible in suitable microsites from the seed rain and/or by establishment from persistent soil seed banks. Cessation of grassland management by grazing or mowing results in litter accumulation, which leads to the decrease of species richness by the decreased availability of open patches. Low amounts of litter are often beneficial, while high amounts of litter are detrimental for seed germination and seedling establishment of short-lived species. However, the magnitude of these effects on germination and seedling establishment in relation to litter and seed attributes are scarcely studied. This motivated us to design an indoor experiment to explore the effects of litter on seedling establishment. We germinated six short-lived Brassicaceae species (Arabidopsis thaliana, Capsella bursa-pastoris, Descurainia sophia, Erophila verna, Lepidium campestre, and Lepidium perfoliatum) with different seed mass under increasing litter cover. We found that both seed mass and litter had significant effect on germination and establishment of the sown species. Small-seeded species were significantly negatively affected by the 300 g/m2 and/or 600 g/m2 litter layers. No negative litter effect was detected for species with high seed masses (Lepidium spp.). No overall significant positive litter effect was found, although for most of the species; total seedling numbers was not the highest at the “bare soil” pots. Our results suggest that the effects of litter accumulation on the germination and establishment of short-lived species are less feasible in case of large-seeded species than on small-seeded ones.
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Study of the agronomic value of artificial extensive grasslands
28-35Views:51The agricultural value of an extensive, alternativly used grassland with three seed densities (500 seed m-2, 1000 seed m-2 and 1500 seed m-2) and at two sowing times was examined in an established grassland experiment with herbs on sandy brown forest soil in Gödöllő in the spring and autumn of 2002.
The results showed that treatment No. 3 (=1500 seed m-2) had the highest agricultural value. It can be concluded that the highest seed norm resulted in the highest grass cover. Through the estimated agricultural value, we have also proved that the grass established in autumn grows more vigorously than the dicotyledonous species. This follows from the biological characteristics of the two plant groups. The grasses are tolerant towards cold and perennial species, while most of the dicotyledonous are annual and prefer milder conditions.
Grassland areas with the same ecological basis differ greatly as far as their plant composition is concerned, depending on seed density. In addition, the plant composition changes continusly according to sowing time. -
Kaszálás felhagyás hatása helyreállított szikes és löszgyepek vegetációjára
21-29Views:68Grasslands recovered by sowing of low diversity seed mixtures are frequently managed by mowing. However only a few studies focused on the direct effects of post-restoration mowing on recovered grassland vegetation. In this study we followed vegetation changes in 13 recovered grasslands, in 5×5-m-sized exclosures with continuous and ceased mowing in Hortobágy, East-Hungary. We asked the following study questions:
(i) What are the effects of cessation of mowing on the vegetation structure of recovered grasslands?
(ii) What are the effects of cessation of mowing on the abundance of sown grasses, target and weed species?
(iii) Is yearly mowing an appropriate management for the maintenance of recovered grasslands?
Our results showed that the cessation of mowing caused litter accumulation, decrease in total cover and decrease in the cover of sown grasses compared to the continuously mown exclosures. The cover of perennial weeds was significantly higher in unmown exclosures compared to the mown ones. The species composition in mown exclosures remained more similar to reference grasslands than to the unmown ones. Our results suggest that without a regular post-restoration mowing the favourable stage of recovered grasslands can be rapidly vanished caused by litter accumulation and/or by the expansion of undesirable weedy species. We also stress that yearly mowing is solely enough to maintain grasslands recovered by low-diversity seed sowing, but cannot be considered to be enough to recover target vegetation composition.
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Factors affecting the thousand-grain weight of three grass cultivars
15-21Views:83We analyzed the effects of temperature, precipitation and the age of the mother plants on the change of an important seed quality parameter, the thousand-grain weight (TGW) in the case of three Hungarian cultivars of different grass species (’Tomaj’ red fescue, ’K-50’ tall fescue and ’K-51’ smooth brome). Examining the seed samples of six years from the stocks maintained at the MATE Georgikon Campus (Keszthely), we found that the age of the stocks did not affect the value of TGW. The age of the stocks did not affect the TGW. Only the heat sum lower than average showed negative effect to the TGW in the linear model applied the heat sum and total precipitation calculated between 1st of May to the harvest date, and the age of the stocks as independent factors. Precipitation had a positive but weak effect, the amount of precipitation calculated from 1st of November of the previous year to harvest correlated better with TGW. We also found that proper purification and the TGW-data correction for the same moisture content are necessary in such a comparative study of TGW values of grass seeds.
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Shall we graze?
36-39Views:52Since the end of the 18th century, since 1780, this question has been raised more and more frequently. At that time, an acknowledged authority wrote in his book that we should not graze and the number of those against grazing has been increasing since then. Nowadays many scientific popular and scientific articles are published against grazing.
This short summary examines the question from the aspect of the users and describes those obvious reasons which cannot be neglected. The herds of grazing animals were welcomed by the cities of western countries from Strasbourg to Venice because of their excellent meat quality. This export gave 70% of the country’s revenue.
For the above reasons, the answer to the question of the title is definitely yes!! -
Effect of fertilization on the aminoacid content and aminoacid yield an established all-grass swarde 5.
11-20Views:71The effects of different N, P and K supply levels and their combinations were examined on the amino acid content and yield of an established all-grass sward with seed mixture of eight grass species in the 28th year of a long term fertilization field experiment set up on a calcareous chernozem loamy soil. The lay-out and method of the trial, as well as the fertilizer responses on the hay yield and quality parameters, were published elsewhere (Kádár, 2005; Kádár and Győri, 2005). The soil of the growing site contained around 3% humus, 5% CaCO3, 20-22% clay in the ploughed layer and was originally moderately well supplied with available K, Mg, Mn and Cu and poorly supplied with P and Zn. The trial included 4Nx4Px4K=64 treatments in 2 replications, giving a total of 128 plots. The fertilizers applied were Ca-ammonium nitrate, superphosphate and potassium chloride. The groundwater table was at a depth of 13-15 m and the area was prone to drought. In 2001, however, the area had a satisfactory amount of 621mm precipitation with a fairly good distribution. The grass was established on 21. September 2000. The main results and conclusions can be summarised as follows:
1. The content of GLU, ASP, HIS and ARG increased in the crude protein of the 1st cut hay as a function of N-fertilization up to 12-19%. The same time the content of PRO decreased up to 23%, CYS up to 25%, TRY up to 42% and ALA up to 48% compared to the N-control. The P fertilization raised the concentration of ASP, LEU, GLY, HIS, PHE and CYS, while the content of ALA dropped down to 41% that of P-contol.
2. As a function of NxP positive interactions the content of ASP rose from 7.2 to 10.3%, HIS from 3.8 to 5.8%, ARG from 3.2 to 4.2% compared to the NP control, while the content of ALA diminished from 5.8 to 2.2%, TRY from 1.3 to 0.6%. The K fertilization also depressed the TRY synthesis. The N0P0K0 plots showed 1.59% TRY in protein, while the N3P3K3 maximum supply plots only 0.35%.
3. The yield of amino acids was enhanced 3-4 times by N fertilization, 2.0-2.5 times by P fertilization and 20-30% by K fertilization. The amino acid yield increased on the N3P3K3 plots, compared to the N0P0K0 plots, in the case of ALA and TRY 3-4 times. Most of the other amino acids yielded 8-12 times more, HIS 14 times, PRO 16 times, GLY 18 times and CYS 20 times more. The maximum yield of essential amino acids made up 774 kg/ha, the total amino acid yield 1552 kg/ha and crude-protein 1779 kg/ha in the 1st cut hay.
4. As a result of NxP interactions the ratio of ASP/ALA changed from 1.2 to 4.7, that of ARG/TRY from 2.5 to 6.3, that of HIS/TRY from 2.9 to 9.7 with the increased NP supply. Thus, fertilization can induce an imbalance of amino acids and so change or deteriorate the biological quality of protein. In similar circumstances the forage may require a TRY supplement to restore the imbalance of amino acids. -
magyar
55-58Views:59A cikk a gyepalkotók 2021-2023. évi vetőmagárainak növekedését hasonlítja össze a Magvas Vetőmag Kft. árai alapján.
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Effect of fertilization on the mineral element uptake of an established all-grass sward 4.
3-10Views:47The effects of different N, P and K supply levels and their combinations were examined on the mineral element uptake of an established all-grass sward with seed mixture of eight grass species in the 28th year of a long term fertilization field experiment set up on a calcareous chernozem loamy soil. The lay-out and method of the trial as well as the fertilizer responses on the hay yield, nutritional values and element content were published elsewhere (Kádár, 2005, 2005a; Kádár és Győri, 2005). The soil of the growing site contained around 3% humus, 5% CaCO3, 20-22% clay in the ploughed layer and was originally, moderately well supplied with available K, Mg, Mn and Cu and poorly supplied with P and Zn. The trial included 4Nx4Px4K=64 treatments in 2 replications, giving a total of 128 plots. The fertilizers applied were Ca-ammonium nitrate, superphosphate and potassium chloride. The groundwater table was at a depth of 13-15 m, the area was prone to drought. In 2001, however, the area had satisfactory amount of 621 mm precipitation with a fairly good distribution. The grass was established on 21. September 2000. The main results and conclusions can be summarised as follows:
1. As a function of NxP positive interactions the element uptake of the 1st cut hay expressed as mean of K treatments increased between the N0P0 control and the maximum N3P3 levels as follows: K 62-190, N 45-218, Ca 16-51, S 5-24, P 4-24, Mg 4-16, Na 0.5-5.0 kg/ha; Mn 282-968, Sr 35-170, Zn 32-73, Ba 29-55, B 18-44, Cu 8-40 g/ha. The uptake of Ba increased from 23 to 62 g/ha, that of Ni from 1.5 to 8.9 g/ha as a result of KxP positive interactions. Uptake of Mo measure on K0P0 soil, however, dropped from 1.6 g/ha to 0.4 g/ha on the K3P3 soil as a function of negative KxP interactions.
2. The 2nd cut hay harvested on 9th October 2001 showed only N-effects. The hay yield measured on N-control soil was 1.0 t/ha while on 300 kg/ha/yr N-treatment 3.9 t/ha. The uptake of Fe, Ba and Mo increased 2-fold; uptake of Ca, S, P, Sr, Zn and Co 3-4-fold, uptake of K, N, Mg, Mn, Ba and Cu 5-6-fold, while uptake of Na 33-fold with the maximum N-rate, compared to the N-control and as means of PK treatments.
3. The 2 cuts together gave on the unfertilised control 3 t/ha, while on the N3P3K3 maximum supply level 13 t/ha hay yield. The uptake of Fe, Cr, B, Ni, Mo and Co increased 2-3 times, uptake of Ca, Mg, Mn, K, Zn, Ba and Cu 5-6 times, uptake of S, Sr and P 7-8 times, uptake of N 10 times, while uptake of Na 16 times on the maximum N3P3K3 supply levels, compared to the unfertilised control. The maximal mass of uptaken K and N made up 388 kg/ha, Ca 80 kg/ha, S 49 kg/ha, P 42 kg/ha (96 kg/ha P2O5), Mg 24 kg/ha in 2001.
4. To have 1 t of air-dry hay it was used by grasses as a mean of 25 kg K (30 kg K2O), 20 kg N, 6 kg Ca (8-9 kg CaO), 2-3 kg S, 2 kg P (5 kg P2O5) and 2 kg Mg (3-4 kg MgO). For microelements: 300 g Na, 200 g Fe, 120 g Mn, 100 g Al, 16 g Sr, 13 g Zn, 8 g Ba, 5 g B, 5 g Cu, 1-2 g Ni, 1 g Mo, 0.2 g Cr and 0.1 g Co. The As, Hg Cd, Pb and Se were under detection limit of 1 g. Data may serve for assessing the nutrient demand of all-grass sward. -
On either side of the electric fence: A botanical study of the autumnal aspect of the drained lake bed of a domestic water buffalo pasture in the Zamoly Basin
9-14Views:66Our studies were carried out in a water buffalo pasture of the Zámolyi basin, in the area of the Csíkvarsai meadow, in the bed of a former lake, which was drained in 2022, then dried up by autumn and it was grazed by domestic water buffalo. The grazed area was surrounded by an electric fence. The vegetation of this part of the area and part of the outside was surveyed on 19 of November. We took 3-3 coenological surveys in both separated areas. Based on the results, there were significant floristic and physiognomic differences in the vegetation. Among the clover species, species with ground-running stems (Trifolium repens and T. fragiferum) were dominant in the grazed area, but in the ungrazed area, there was a coherent plant population of 30-40 cm high, densely located alsike clover (Trifolium hybridum) in the lake bed. In addition, the occurrence of swamp pricklegrass (Crypsis schoenoides) was a floristic new discovery.
Due to the loss of water coverage, several Trifolium species have become abundant in the area, which is a result of the germination properties of the species. The thick seed coats were cracked by the loss of the effect of the water coverage on temperature equalisation, and germination could have begun, resulting in a dominant species in the area. During the present study, we have seen a very impressive result of the analysis of the vegetation of the lake bed in autumn aspect in the Zámolyi Basin, which is the result of the impact of water buffalo grazing. The number of species was more significant in the grazed area. Moreover, floristic rarities have been found and as an indicator of grazing, species of different life form types were dominant within the same genus. -
Fungal leaf spot diseases of cultivated grasses
34-42Views:50The authors made plant pathological investigations and data collections on grass species important in their seed production areas in Hungary (Keszthely) and Austria (Irdning). The aim was to determine species diversity and dominance relations of plant pathogenic fungal species found on the cultivated grasses of the two ecologically different locations. The present work details only the leaf spot causing fungi and does not inform on rust causing fungi, powdery mildew, and smuts. The work gives information on fungal incidence on grass species, their importance and symptoms of disease caused by Cercosporidium graminis, Ramularia pusilla, Drechslera spp., Bipolaris spp., Mastigosporium spp., Septoria, Ascochyta spp. and Colletotrichum graminicola.
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Digestibility and nutritive value of late mowed grassland
63-69Views:51Nutritive value of a fodder from extensive established pasture was tested. The nutrient content was measured by the Wendeeanalysis and by in vitro ruminant digestibility method. Results of former experiments showed that the nutritive value of an extensive established pasture in the case of late outdoor growing is low. In our results the highest crude protein content was in the year 2002, while in 2003 can be observed a steep decline, which showed in 2004 further decrease. The crude protein values were the highest in case of middle seed norm. The nutritive values of these pastures provide just supply for the demand and it was declined due to the negative N-balance in the rumen. Our results showed that the samples from the year of establishment could possibly be used for preserved feed (6.01 MJ NE l kg-1). The crop from all other years and sowing times did not reach a value of 5.00 MJ NE l kg-1, but approach a level of 4.4 to 4.5 MJ NE l kg-1, thus they would not be suitable for preserved feed. It can be recommended that this late season crop should rather be used for grazing of livestock than as preserved feed.
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The effect of fertilization on the mineral contant of artificial grasslands 3.
57-66Views:67The effects of different N, P and K supply levels and their combinations were examined on the mineral element content of an established all-grass sward with seed mixture of eight grass species in the 28th year of a long term fertilization field experiment set up on a calcareous chernozem loamy soil. The lay-out and method of the trial as well as the fertilizer responses on the hay yield were published elsewhere (Kádár 2004). The effect of fertilization on the nutritional values and nutrient yield also described earlier (Kádár and Győri, 2005). The soil of the growing site contained around 3% humus, 5% CaCO3, 20-22% clay in the ploughed layer and was originally, moderately well supplied with available K, Mg, Mn and Cu and poorly supplied with P and Zn. The trial included 4Nx4Px4K=64 treatments in 2 replications, giving a total of 128 plots. The fertilizers applied were Ca-ammonium nitrate, superphosphate and potassium chloride. The groundwater table was at a depth of 13-15 m, the area was prone to drought. In 2001, however the area had a satisfactory amount of 621mm precipitation with a fairly good distribution. The grass was established on 21. September 2000. The main results and conclusions can be summarised as follows:
1. As a function of N-fertilization the element content of the 1st cut hay usually increased, except for Al and Mo, which showed dilution effects. The concentration of K, Ca, Mg, Mn, P, Sr, B, Ni enhanced with 25-50%, S and Co with 60-70%, N and Cu 2-times, NO3-N and Na about 5-times compared to the N-control. The P-fertilization stimulated uptake of Mn and Mg for 10-20%; S, NO3-N and Co for 40-50%, Na and for Sr 60-70%, P for 90%, however, inhibited the uptake of Zn and Co for 20-40%, Al and Fe for 50-60%, Mo for 70% compared to the P-control.
2. The P/Zn ratio showed on P-control soil optimal values of 118, while on highly P-supplied soil 278 P/Zn ratio, so indicating Zn-deficiency. As a function of PxK negative interactions, concentration of Fe dropped from 307 to 105 Al from 206 to 60, Mo from 0.44 to 0.05, Cr from 0.33 to 0.12 mg/kg in air-dry hay. The Cu/Mo ration on N-control soil showed the optimal value of approx. 10, while on heavily fertilized with N soil that of 40-80, indicating extreme Mo-deficiency.
3. The 2nd cut hay contained about 20% more N, K, Ca, Mg, Na, 40% more Cu, 70-80% more S and Mn, 90% more Fe and P, 140% more Al and nearly 5-times more Mo. The content of B did not changed, while NO3-N dropped about 40% . The Cu/Mo ratio showed value of 2.6 on N-control soil, while on heavily fertilized with N soil ratio of 7.8. The P/Zn ratio indicated on P-control soil optimal value of 150, while on overfertilized with P soil value of 269. So, the P-induced Zn-deficiency could also be proven in the 2nd cut hay, while the Cu-induced Mo-deficiency disappered.
4. The N-fertilization stimulated in the 2nd cut hay also the accumulation of elements N, K, Mg, P, Mn, Cu and Ni with 20-50% compared to the N-control. The NO3-N increased 4-times, while Na content 10-times. However the elements Fe, Al, B, Mo and Cr showed a dilution effect with 20-60%. The P-fertilization increased the concentration of Mn, Sr, Cd, Co, S and P, while decreased the content of Na, NO3-N, Cu and Zn. As a general rule, the K-fertilization hindered the accumulation of metal cations. The P-induced Cd accumulation was fully counterbalanced by increasing K-supply of soil.
5. Summarizing above we can state that the long-term fertilization can drastically (in some cases with an order of magnitude) change the concentrations and ratios of elements built in hay through synergetic or antagonistic effects. In the 1st cut hay, for example, the minima-maxima contents of measured elements varied in air-dry hay as follows: N 0.90-3.02, Ca 0.4-0.7, S 0.14-0.32, P 0.12-0.30, Mg 0.10-0.24%; Na 70-700, Fe 100-288, Al 45-250, Mn 71-130, Sr 10-22, Zn 7-14, Ba 6-11, B 3.6-8.1, Ni 0.3-1.6, Cr 0.1-0.4, Mo 0.04-0.44, Co 0.04-0.12 mg/kg. -
The effects of fertilization on a 6 years old established grassland
19-30Views:42The effect of different N, P and K supply levels and their combinations were examined in the 33rd year of a long-term fertilization experiment on the yield and mineral element content of a 6 years old established all-grass sward in 2006, with seed mixture of eight grass species. The trial was established on a calcareous chernozem soil. The soil of the growing site contained around 3% humus, 5% CaCO3, 20-22% clay in the ploughed layer and was originally moderately well supplied with available K, Mg, Mn and Cu and poorly supplied with P and Zn. The trial included 4N×4P×4K=64 treatments in 2 replications, giving a total of 128 plots. The fertilizers applied were Ca-ammonium nitrate, super phosphate and potassium chloride. The groundwater table was at a depth of 13-15 m and the area was prone to drought. The 1st cut was made on 08th June, the 2nd one on 11th September. During the vegetation period of 8.5 months in 2006, the site had a total of 397 mm precipitation. The lay-out, method and main results of the trial were published earlier (Kádár, 2004, 2008; Kádár és Győri, 2004, 2005). Main conclusions of this study are as follows:
- The 1st cut hay yield gave the ¾ of the total yield. Highest yields were reached with the 200 kg/ha/year N-fertilization on soil well supplied with P (Ammonium-lactate soluble P2O5: 214 mg/kg). The yield of NP control plots increased from 1.5 t/ha to about 7.5 t/ha as a function of the N×P positive interaction. The rising P supply alone was not able to enhance the yield, however the N fertilization gave 3.5 t/ha hay surplus even in the P-control treatments. N and P fertilization together resulted in 6.0-6.5 t/ha yield surpluses. The effect of K fertilization also reached 1 t/ha on the NP levels where the ammonium-lactate soluble K2O content fell below 150 mg/kg.
- The 2nd cut hay gave 0.5 t/ha on the NP-control plots unfertilized for 33 years, and 2.5 t/ha on the 300 kg/ha/year N treatment with well P-supply. The two cuts together resulted in yield levels between 2-10 t/ha according to the extreme NPK supply. In this year, with relatively good amount of precipitation, the hay yield surpluses for 1 kg N were 47-33-23 kg for the 100-200-300 kg/ha treatments.
- The C/N ratio of the 1st cut was narrowed (from 52 to 24) with N-supply and the concentration of N as well as most of the cations increased with the rising N fertilization. In the low yield of the 2nd cut the elements, metals were accumulated. The P, S and Sr were enriched in hay as a result of rising P supply, as superphosphate contains these elements. Antagonistic effect of P predominated in the uptake of other elements, metals (Na, Zn, Cu, Mo, Cr, Co). K content of the hay was lifting while other elements were dropping with the increasing K fertilization partly as a result of dilution effect (N, P, S) and mainly because of cation antagonism (Ca, Mg, Na, Sr). K-B antagonism also appeared.
- The N×K interactions resulted in 2-fold Sr and 18-22 fold Na content changes while N×P caused 18-22 fold changes in Mo contents, especially at the 2nd cut. As it can be seen, fertilization can have drastical effects on soil and crops. The induced element deficiencies or oversupplies can lead to diseases, disturbances in the metabolism of animals, so the soil and fodder analyses are necessary.
- Considering the leaf diagnostical data, the satisfactory level will be at 200 kg/ha/year N supply and 150 mg/kg ammonium-lactate soluble P2O5 and K2O level or above. The S, Ca, Mg, Fe, Mn supply were satisfactory even at the control plots, while the Zn, Cu and B levels showed deficiency. The P/Zn and K/B ratios became adversely wider in some treatments, as well as the narrowing of the Cu/Mo ratio denotes Cu deficiency and Mo oversupply.
- The amount of elements uptaken by hay as a sum of the two cuts and as a function of the supply/yield varied between the following values in kg/ha: 17-163 N; 36-122 K; 9-48 Ca; 6-17 P; 4-15 S; 3-14 Mg; 0,3-8,0 Na; 0,2-1,4 Fe; 0,2-0,9 Al and Mn. The other elements showed the following uptake: Zn 33-194, Sr 28-141, Ba 5-46, Cu 5-39, B 5-26, Mo 3-6 g/ha.
- The botanical composition was drastically modified by the aging of the grass and the nutrient supply. Only three species remained out of the eight sown species and one immigrated. Coverage of the tall fescue was between 21-70% according to the N×P supply and 44% as average; coverage of cocksfoot varied between 4-24% depending on the treatment and 18% as an average; coverage of crested wheatgrass was between 0-28% and 9% as an average; the immigrant smooth brome covered 0-24% and 9% as an average; Weed cover was 3-4% as an average at the 1st cut. Weeds thrived mainly on those areas where the grass thinned away (extreme NP-deficiency or oversupply). The total plant coverage on NP-deficient soil was about 50%, while on treatments well supplied with NP it amounted 95-97%.