POTASSIUM FRACTIONS AS INFLUENCED BY POTASH MANAGEMENT THROUGH GLIRICIDIA GREEN LEAF MANURING IN SOYBEAN GROWN ON VERTISOLS.
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Date
2019-06-26
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Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
A field study entitled, “Potassium fractions as influenced by potash management through gliricidia green leaf manuring in soybean grown on Vertisols” was conducted during kharif 2018 at Research field of AICRP for Dryland Agriculture, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra. The soil of the experimental site was Vertisol which was moderately alkaline in reaction, low in available nitrogen, medium in available phosphorus and high in available potassium.
The six treatments replicated four times in randomized block design comprised of control, 100% RDF (30:75:30 NPK kg ha-1), 75% and 50% N and 100% P through chemical fertilizers and the combinations of 15 and 30 kg K ha-1 through gliricidia green leaf manure at 30 DAS and remaining recommended dose of potassium as basal dose through inorganic fertilizers.
The results indicated that application of 75% N +100% P+15 kg K (inorganic) +15 kg K through gliricidia resulted in higher soybean yield and was on par with application of 75%N +100%P +30kg K through gliricidia, application of 50% N +100% P+30kg K through gliricidia and application of 100% RDF (30:75:30 NPK kg ha-1). However, the significant improvement in chemical properties of soil and potassium fractions was recorded with application of 75% N +100% P+15 kg K through chemical fertilizers +15 kg K through gliricidia. Among the various potassium fractions, the water soluble K was highly correlated with soybean grain yield.
In view of the above, it can be stated that the use of gliricidia green leaf manuring at 30 DAS in conjunction with chemical fertilizers recorded higher soybean yield with improvement in soil fertility and combination of inorganic fertilizers with organics is essential to maintain the soil health and increase the potassium use efficiency.
Hence, it is concluded that the integrated application of 75% N +100%P+ 50% K through chemical fertilizer and 50% K through gliricidia green leaf manuring at 30 DAS resulted in improvement in potassium fractions, soil fertility and yield of soybean grown in Vertisols under rainfed conditions.
Description
The investigator studied the changes in potassium fractions in soil, soil fertility status and yield of soybean crop due to effect of potash management through gliricidia green leaf manure. The investigator has also tried to correlate among yield and various potassium fractions.
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Citation
YADAV, JAIPAL. (2019). Potassium fractions as influenced by potash management through gliricidia green leaf manuring in soybean grown on vertisols. Department of Soil science and Agricultural chemistry, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xii, 109p. (Unpublished).