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Soil microbial biomass and community responses to long-term tillage and fertilizer regimes in corn under corn-winter wheat rotation
33-41Views:75Agrotechnical interventions, namely, tillage and fertilization have a great influence on soil microbial activities and biomass, hence it is important to investigate their effect in long-term experiments. This study aimed at evaluating the impact of long-term tillage and NPK mineral fertilizer application on soil microbiological parameters in corn grown under corn-winter wheat rotation. The soil samples were collected in June of 2024 from the long-term experiment of the University of Debrecen at Látókép established in 1991. The treatments included control (no fertilizer), NPK fertilization (160 kg ha-1 N, 60 kg ha-1 P2O5, 90 kg ha-1 K2O) and tillages (Moldboard tillage-MT, Strip tillage-ST and Ripper tillage-RT). The soil microbial biomass and composition of its community (Actinomycetes, saprophytic fungi, Gram-positive bacteria, Arbuscular mycorrhizal fungi, Gram-negative bacteria) was measured by PLFA analysis of soil extract. Results indicate that NPK fertilization affected only the biomass of Arbuscular mycorrhizal fungi and Actinomycetes, whereas tillage greatly influenced the soil microbial biomass and community composition for all the microbial groups. Generally, the microbial biomass and community composition were highest under RT followed by ST and lowest under MT. In conclusion, conservation tillages are more favorable for soil microbial life than conventional tillage.
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The study of the fertilizing effect of wheat straw ash in a greenhouse experiment
47-51Views:661The effect of wheat straw ash as a fertlizizer was studied in a pot experiment with an acidic sandy loam soil (pHKCl=4.9) with weak K and P supply. The test plant was ryegrass (Lolium perenne). The treatments were the following: 1. control untreated soil, 2. NPK fertilizer, 3. small dose of ash (1.4 g kg-1), 4 large dose of ash (2.8 g kg-1), 5. small dose ash completed with NP fertilizers. Soil parameters (pHH2O, pHKCl, ammoinum-lactate soluble P, K, 0.01 M CaCl2 soluble PO43--P, K, Mn, Cu, Zn ) and plant parameters (yield, P, K, Ca, Mg, Zn, Mn uptake) were investigated. Based on the analysis of the straw ash sample and the results of pot experiment it can be stated that the wheat straw ash is suitable for the fertilization of the studied soil. The small dose ash completed with NP resulted in the largest yield increment (43%). In order of the treatments the pHKCl changes to: 4.9, 4.8, 5.2, 5.8, 5.1. As the N : P2O5 : K2O ratio is 0 : 1: 3.5 in the wheat straw ash sample, to reach optimal yield ash should be completed with N and P.
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Influences of different organic fertilizers on nutrients of humic sandy soil and on the growth of Spinach (Spinacia oleracea L.)
23-28Views:707A greenhouse pot experiment was conducted to compare the effects of manure with different origin (horse, cattle), various bedding materials (straw, sawdust) and diverse doses (30 t ha-1, 60 t ha-1) and the impact of food waste compost on the plant growth and the available plant nutrient content of soil. The study was conducted on humic sandy soil and consisted of 9 treatments in a randomized complete block design with four replications. Spinach (Spinacia oleracea L.) was grown as the test crop. The treatments were: 1. unfertilized control; 2. horse manure with straw (30 t ha-1); 3. horse manure with sawdust (30 t ha-1); 4. cattle manure (30 t ha-1); 5 food waste compost (30 t ha-1); 6. horse manure with straw (60 t ha-1); 7. horse manure with sawdust (60 t ha-1); 8. cattle manure (60 t ha-1); 9. food waste compost (60 t ha-1). Plant growth was monitored for 4 weeks. Shoot and root weights per pot were measured, total biomass weight per pot were counted.
On the basis of the results it can be concluded, that among treatments the application of horse manure with straw enhanced spinach growth most significantly compared to other treatments and to the non-treated control, resulted the highest weights of leaves and roots of spinach. At the same time even small dose (30 t ha-1) of this fertilizer caused increased plant available nitrogen and phosphorus of soil and the higher dosage further increased these values. The horse manure with sawdust applied in lower dose did not alter the leaves and roots weights, but higher portion (60 t ha-1) caused significantly decreased plant biomass. The results proved that the bedding material may significantly alter the composition of manure and may change the plant nutrition effect of organic fertilizer. Cattle manure and food waste compost in both applied doses enhanced plant growth. Both fertilizers increased the plant available nitrogen forms and phosphorus content of soil, but cattle manure caused higher increase.
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The effect of zinc fertilization on the yield and element content of ryegrass
27-31Views:278The effect of Zn fertilization on the yield and Zn, N, P, K, Mg and Mn content of ryegrass was studied in a greenhouse experiment for 8 chernozem soils with three replicates under uniform NPK supply and irrigation. The applied Zn rates were 0, 2.5 and 5 mg/kg Zn. Due to Zn doses the yield incrased significantly. Zn fertilization increased the plant Zn content and decreased the plant P and Mn content significantly. For N, K and Mg there was no significant effect.