Micronutrient management for grain, yield and quality of inoculated soybean
2001
Zada, K. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Agronomy) | Kakar, K.M. | Shah, P.
Poor yield and growth of soybean exist in North West Frontier Province (NWFP) of Pakistan which could be due to in-appropriate plant nutrition specially the micro nutrients. The effects of Iron (Fe) and Zinc (Zn) on grain, N yield and quality of inoculated soybean were investigated in pot experiments conducted at Nuclear Institute for Food and Agriculture (NIFA) during 1993 and NWFP Agricultural University, Peshawar during 1994 on clay loam and slit clay loam soil. Fe was applied @ 0,7014 and Zinc 0,5,10 kg/ha-1 before sowing on soil weight basis Fe and Zn significantly increased grain yield by having increases in nitrogen metabolism and protein synthesis. Zinc application increased grain yield more than Fe during both the years where the % increases over control were more in the year 1994 due to favourable growing conditions. The nitrogen fixation and nitrogen fixing efficiency (NFE) in the form of total N recovery fixed in grains, shoots and soils improved linearly with Fe and Zn nutrition. By and large, the management of these micronutrient in increasing grain yield and nitrogen fixation has been documented. Application of Fe and Zn improved the quality of soybean grain by having increase in protein contents. Fe increased grain protein more than did the Zinc, where Zn produced more fats in grains than did Fe, both having negative correlation, This showed that a considerable portion of total increase in protein as a result of micronutrient nutrition could be accounted for due to effects of decreases in fat contents.
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