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Agronomic evaluation of different lettuce (Lactuca sativa L.) varieties under unheated plastic tunnel
50-56.Views:592Among the leafy vegetables, lettuce (Lactuca sativa L.) is the most widely grown species in the world. Wide ranges of physical properties of the products are used to assess the degree of maturity. In this study, different lettuce varieties were grown under an unheated plastic tunnel in springtime. We evaluated the agronomic properties of different lettuce varieties, evaluated the condition of the plants, and determined the bioactive substances. Larger head weight can be achieved by the ‘King of May’ butterhead (259.31 g) and ‘Great Lakes 659’crisphead (220.40 g) genotypes. A very strong correlation (r = 0.995) was observed between the lettuce head index, and leaf index and both had a strong positive correlation (r = 0.828 and 0.760) with NDVI. The highest SPAD values were measured for cos lettuce ‘Romaine lettuce’ (44.01) and iceberg lettuce ‘Great Lakes 659’ (42.71). However, these genotypes showed the highest (9.52%; 8.74%) dry matter content, too. The red leaf variety 'Lollo Rosso' had the highest total polyphenol content (181.53 GAE/100 g FW). Among the evaluated properties, iceberg lettuce showed favorable morphology, plant condition, and good dry matter content. In addition, between the loose-leaf lettuces, the red leaf lollo type was outstanding with bioactive content.
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Effect of various growing media on growth and yield of lettuce in hydroponics system at Lalitpur, Nepal
41-47.Views:178Hydroponic farming, particularly using the nutrient film technique, is gaining traction as a sustainable approach for cultivating leafy vegetables such as lettuce. However, the selection of appropriate growing media remains critical for optimizing plant growth and yield in a soilless system. A completely randomized design (CRD) was used in this study to assess the impact of six distinct growing media (sponge made up of cellulose, perlite, saw dust, sand, cocopeat, and rice husk) on the growth and yield of lettuce under NFT conditions at Mutha Agro Pvt. Ltd., Lalitpur, Nepal. Analysis of variance (ANOVA) in RStudio (v4.4.1) was used to examine the data, and Tukey HSD test was used to differentiate treatment means at a 5% significance level. Lettuce grown in sponge media exhibited the highest performance in terms of number of leaves (11), longest leaf length (17.55 cm), greatest leaf width (9.43cm), plant height (35.81 cm), root length (12.51 cm), canopy diameter (36.07 cm), and stem diameter (0.62 cm). The highest fresh root weight (24.67 g) and moisture loss (98.7%) were obtained by perlite. The highest yield was recorded in sponge (146.45 g), followed by perlite (139.65 g), while the lowest was observed in rice husk (117.83 g). Overall, sponge made up of cellulose proved to be the most effective growing medium for hydroponic lettuce cultivation using NFT, followed by perlite. These findings can help guide growers in selecting suitable substrates to improve yield and quality in hydroponic production systems.
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The effect of soil mixtures of different consistence and phosphorus content in tray transplant-growing by lettuce
71-76.Views:401The transplant-growing with root balls gets more and more popular and time to time the only method even in high-quality lettuce transplant-growing. To work out the technology of transplant-growing in trays it was needed to define the accurate physical and chemical consistency of applied soils.
The transplant production in trays could become a good method in field-grown lettuce technologies. The production of transplants of good quality with this technology could be realised only by accurate soil mixtures.
The matter of transplant-growing substrates could be a low-moor turf. Its qualities could be positively influenced by adding minerals like bentonite in amount of 5 (or 10) V%.
To ensure enough phosphorus for the demands of transplants we have to add more fertilisers. The best results by lettuce we got by adding 4 kg/m3 superphosphate to the soil mixture.
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Reducing nitrate content in lettuce using polyolefin-coated fertilizers
35-38.Views:230Pot experiments were conducted in order to investigate the effects of the controlled-release characteristic, nitrogen form and application method of polyolefin-coated fertilizers on the nitrate content and yield of lettuce (Lactuca sativa L.). Comparing broadcast application of polyolefin-coated urea (POCU) and urea at four fertilization levels, it was found that application of POCU decreased the nitrate content and increased the yield, due solely to its controlled-release characteristic. Comparing band applications of POCU or polyolefin-coated diammonium-phosphate (POC-DAP) to broadcast application of ammonium nitrate, it was found that a band application of both urea and ammonium containing polyolefin-coated fertilizers can decrease nitrate content in lettuce, without causing any significant yield decrease. This was a combined effect of the controlled-release characteristic and realized ammonium nutrition. Comparing effects of broadcast, band and spot applications of POC-DAP, it was found that nitrate content, was the lowest in the spot application treatment. However, considering both nitrate content and yield, band application was found to be the most effective application method.
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Salt tolerance of sweet pepper seedlings
62-66.Views:360Laboratory germination tests have been made with three white fruit pepper varieties and with one spice pepper in filter paper rolls wetted with KCl solutions of different concentration. Parallel tests have been conducted with the other species (lettuce, tomato, kohlrabi) to compare the salt tolerance of paprika with that of other vegetable crops.
In greenhouse, the action of KCl has been investigated with transplants raised in soil mixture, in rockwool and with seedlings transplanted from rockwool into soil mixture. Like the trials in the laboratory, the experiments in soil mixture have been made with other plant species, too.
