A long-term fertility trial was initiated in 1992 to study the effects of manures and fertilizers onthe productivity of maize-toria (mustard) rotation. The response of maize in the first year to the treatments under study (manure, lime and fertilizers) was found   to be non-significant. However, from the second year the grain yield of toria and from the third year the grain yield ofmaize were found to be consistently declining. From third year both maize and toria have beenshowing a gradual decline in grain yields during the succeeding years till 1998. The difference in response to calcite and dolomite   lime was found non significant. Biotic and abiotcconstraints could be the reason for declining the yield of both crops. The sharp decline in thegrain yield suggests laboratory investigation and treatments modification.

A long-term fertility trial was initiated in 1992 to study the effects of manures and fertilizers onthe productivity of maize-toria (mustard) rotation. The response of maize in the first year to the treatments under study (manure, lime and fertilizers) was found   to be non-significant. However, from the second year the grain yield of toria and from the third year the grain yield ofmaize were found to be consistently declining. From third year both maize and toria have beenshowing a gradual decline in grain yields during the succeeding years till 1998. The difference in response to calcite and dolomite   lime was found non significant. Biotic and abiotcconstraints could be the reason for declining the yield of both crops. The sharp decline in thegrain yield suggests laboratory investigation and treatments modification.