National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Field experiments were conducted at the Agricultural Research Farm of Krishi Vigyan Kendra, SKUAST-K, Shuhama, Srinagar to study the effect of composted municipal sludge application on efficiency of primary nutrients viz. nitrogen, phosphorus and potassium in maize (Zea mays L.). Application of 75% NPK + sludge @ 30 t ha-1 resulted in highest yields and nutrient uptake by the crop followed by NPK + sludge @ 15 t ha-1, 75% NPK + sludge @ 15 t ha-1 and 50% NPK + 30 sludge @ 30 t ha-1. These were statistically identical to each other for seed and stover yields. Highest agronomic efficiency of nitrogen, phosphorus and potassium was observed in 50% NPK + Sludge @ 30 t ha-1 followed by 50% NPK + Sludge @ 15 t ha-1, 75% NPK + Sludge @ 30 t ha-1, 75% NPK + Sludge @ 15 t ha-1, NPK + Sludge @ 15 t ha-1 and NPK. Recovery efficiency of nitrogen, phosphorus and potassium was maximum in 75% NPK + Sludge @ 30 t ha-1 followed by NPK + Sludge @ 15 t ha-1, 75% NPK + Sludge @ 15 t ha-1, 50% NPK + Sludge @ 30 t ha-1, NPK and 50% NPK + Sludge @ 15 t ha-1. Highest physiological efficiency of nitrogen, phosphorus and potassium was recorded in 50% NPK + Sludge @ 15 t ha-1 followed by NPK, 50% NPK + Sludge @ 30 t ha-1 and 75% NPK + Sludge @ 15 t ha-1. Highest economic efficiency of nitrogen, phosphorus and potassium was registered with 50% NPK + Sludge @ 30 t ha-1 followed by 50% NPK + Sludge @ 15 t ha-1, 75% NPK + Sludge @ 30 t ha-1, 75% NPK + Sludge @ 15 t ha-1, 75% NPK + Sludge @ 15 t ha-1, NPK + Sludge @ 15 t ha-1 and NPK. The results clearly indicated that use of composted sludge could increase the efficiency of primary nutrients and decrease the requirement of NPK fertilizers by 25-50 percent under temperate Himalayas.
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