Vol. 7 (2) : March-April 2016 issue
Green Farming Vol. 7 (2) : 365-370 ; March-April, 2016
Effect of long-term application of fertilizers and manure on profile distribution of various phosphorus fractions in Vertisol
LOKESH DUBEY1, B.S. DWIVEDI2, A.K. DWIVEDI3 and RISIKESH THAKUR4*
Department of Soil Science & Agril. Chem., J.N. Krishi Vishwa Vidyalaya, Jabalpur - 482 004 (Madhya Pradesh)
Designation : 1Student, 2Scientist, 3Principal Scientist, 4Asstt. Professor *(rkthakur28@rediffmail.com)
Subject : Soil Science & Agric. Chemistry; Soil Health & Soil Conservation Engg.
Paper No. : P-3662
Total Pages : 6
Received : 07 May 2015
Revised accepted : 05 March 2016
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Citation :
LOKESH DUBEY, B.S. DWIVEDI, A.K. DWIVEDI and RISIKESH THAKUR. 2016. Effect of long-term application of fertilizers and manure on profile distribution of various phosphorus fractions in Vertisol. Green Farming Vol. 7 (2) : 365-370 ; March-April, 2016
ABSTRACT
The study was conducted during 2009-10 under the ongoing All India Coordinated Research Project on Long-Term Fertilizer Experiment with Soybean-Wheat sequence, commenced from 1972 at J.N.K.V.V., Jabalpur (MP). The study attempted to find out the effect of continuous application of different agricultural inputs on the depth-wise distribution of phosphorus fraction and other nutrients (NPK) in a Typic Haplustert (Vertisol). The phosphorus fractions and other nutrients were relatively higher in surface soil (0-20 cm) and their contents continued to decrease with increasing soil depth, amongst all the treatments. The results revealed that the highest values of phosphorous fractions (16.47, 36.74, 60.73, 11.90 & 219.71 mg/kg Saloid-P, Al-P, Fe-P, Occluded-P and Ca-P, respectively) were found associated with 100% NPK + FYM at 0-20 cm soil depth. Application of 100% N alone resulted in lower values of available N, P, K and fractions of P contents in the profile. The Ca-P form was found to be predominantly in higher amounts followed by Fe-P and Al-P while Saloid-P contributed least content. Further, the productivity of soybean was gently influenced with balanced fertilizer application over imbalance application. The yield of soybean was significantly correlated with available P (0.575), Occluded-P (0.730) and Ca-P (0.764). The correlation coefficient of Saloid-P with yield was estimated to be 0.687 which was lowest among all the fractions considered here. Thus, the Ca-P form was found to be predominantly in higher amounts followed by Fe-P and Al-P while Saloid-P contributed least content. The order of P fraction content in soil are Ca-P>Fe-P>Al-P>Occluded P>Saloid-P in a Vertisol.
Key words :
Available major nutrients, Distribution pattern, P fractions, Soybean-wheat sequence.