Punjab Agricultural University, Ludhiana
Online published on 25 January, 2012.
Application of 40 kg. P2O5/ha on loamy sand soil low and medium in available N and P respectively, recorded a significant increase of 39−4% in grain yield of arhar over controls. A further increase in the dose did not show significant improvement in yield. Phosphatic fertilizer placed at 10 and 17.5 cm. depths in the seed furrow or 17.5 cm. deep along the side of the furrow proved superior to broadcast application. Residual phosphorus from arhar showed significant beneficial effect on grain yield of succeeding wheat. Comparison of wheat yields of no phosphorus plots of arhar-wheat and fallow-wheat rotations showed that each level of nitrogen recorded significantly lower wheat yield in the former rotation than the latter. 100 kg. N/ha was observed to be adequate for late sown (December 8) wheat succeeding arhar.
