Effect of long term application of fertilizers and manure on leaf area index, nodulation and yield of soybean in a Vertisol

Abstract

The study was conducted on the Research Farm of Department of Soil Science and Agricultural Chemistry, JNKVV, Jabalpur. The experiment was commenced in June 1972. The present study comprised of ten treatments i.e. 50% NPK, 100% NPK, 150% NPK, 100% NPK+HW, 100% NPK+Zn, 100%, 100%, 100% NPK+FYM, 100% NPK-S and control with four replications in simple randomized block design. Soybean Crop was raised with all the standard recommended agronomic practices other than those under treatments. The results on nodulation revealed that the maximum nodule number and dry weight of nodule was recorded when 100% NPK was supplemented with FYM whereas minimum was confined in control followed by N alone. The continuous application of fertilizer and manure resulted in significant response for grain and straw yield. The highest value of grain and straw was recorded in 100% NPK+FYM and lowest value in control.