Effect of preceding crops and nitrogen rates on chemical studies of winter hybrid maize (zea mays l)

Author: 
Yadav B. P., Yadav D. N., Koirala K. B., Pandey K. R and Thapa R. B

A field experiment was conducted at Agronomy research farm of IAAS, Rampur, chitwan, Nepal during summer and winter season 2010 and 2011 to study the effect of crop sequence and nitrogen rates on hybrid maize. There were thirty treatment combination consisting of six crop sequences, maize-maize, fallow-maize, greengram-maize, cowpea-maize, blackgram-maize, clusterbean-maize in main plots and five nitrogen rates 0, 50, 100, 150, 200 kg/ha in subplots with three replication. The research finding revealed that maximum nitrogen uptake (78 .9 kg /ha in 2010 and 84.0 kg /ha in 2011) by maize was recorded under greengram– maize sequences while it was minimum (48.0 kg/ha in 2010 and 54.8 kg/ha in 2011) under maize– maize sequences. Nitrogen uptake by maize was maximum (97.2 kg/ha in 2010 and 106.4 kg/ha in 2011) with 200 kg N/ha while it was minimum (31.9 kg/ha in 2010 and 36.0 kg N/ha in 2011) with no nitrogen. Total uptake of nitrogen by crop sequence as a whole was maximum (199 .0 kg /ha in 2010 and 216 .0 kg /ha in 2011) under maize– maize sequences and it was minimum (69 .3 kg N/ha in 2010 and 74 .4 kg N/ha in 2011) under clusterbean – maize sequences. Total uptake of nitrogen by crop sequences as a whole was maximum (175.1 kg /ha in 2010 and 188.9 kg /ha in 2011) with 200 kg N/ha while it was minimum (106 .7 kg /ha in 2010 and 116 .9 kg /ha in 2011) with no nitrogen application. Maximum organic carbon content of soil (1.26 % in each year) was recorded after greengram while it was minimum (1.20 % in 2010 and 1.19% in 2011) after clusterbean .Organic carbon content of soil was maximum (1.23 % in 2010 and 1.22 % in 2011) after greengram– maize sequences while it was minimum (1.18 % in each year) after clusterbean –maize sequences. Maximum organic carbon content of soil (1.241 % in 2010 and 1.221 % in 2011) was recorded with 150 and 200 kg N/ha while it was minimum (1.16 % in 2010 and 1.17 % in 2011) was no nitrogen. Total nitrogen content of soil was maximum (0.1228 % in 2010 and 0.1224 % in 2011) after greengram while it was minimum (0.1163 %) after fallow in 2010. But in 2011, minimum soil nitrogen content (0.1164 %) was noted after clusterbean which was comparable to total nitrogen content after fallow. Maximum total nitrogen content of soil ( 0.1191 % in 2010 and 0. 1187 % in 2011 ) was recorded after greengram – maize sequences while it was minimum ( 0.1132 % in 2010 and 0.1114 % in 2011 ) after fallow – maize sequences . Total nitrogen content of soil was maximum (0.1228 % 2010 and 0.1198% 2011) with 200kg N/ha while it was minimum (0.1134% in 2010 and 0.1123% in 2011)s with no nitrogen application. Though the interaction effect of crop sequences with nitrogen rates on the grain yield of maize was not significant, greengram– maize and cowpea– maize sequences performed better than clusterbean – maize, fallow – maize and maize – maize. Yield under greengram– maize sequences at 50 and 100 kg N/ha was comparable to the yield at 150 and 200 kg N rate respectively under fallow– maize sequences. Thus, around 50 kg chemical nitrogen per hectare for maize can be saved by inclusion of greengram and cowpea in the sequences. From economic point of view greengram- maize sequences was the best followed by cowpea – maize. Inclusion of legume in the crop sequences seems to be remunerative with positive effect on soil fertility.

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