Effects of N-serve on soybeans and soil nitrogen transformations
1980
Morris, D.R. | Boonkerd, N. | Vasuvat, Y. (Department of Agriculture, Bangkhen, Bangkok (Thailand). Plant Pathology Div.)
Plant dry weight, total N, and total Ca increased at 0.1 and 1 ppm N-serve. At greater 10 pp, the plants showed visual symptoms of a stunted growth, stem elongation, flowers and pods failed to form or were aborted, young leaves were curled, and roots were club shaped with many branches. These symptoms were increasingly evident with increasing N-serve application rates. The reason was attributed to an auxin effect. Dry wt and total N in the plant was less than the control at the higher N-serve applications. There was little effect on nitrogenase activity at less than 10 ppm N-serve, Nodulation tended to increase at 0.1 and 0 ppm N-serve. Nitrification was inhibited up to 104 days at 20 ppm N-serve. The soil pH of the high N-serve rates was decreased at 104 days probably due to nitrification. Generally there were little detectable differences among treatments in soil organic N. The average soil organic N and 0 to 104 days decreased by 0.01 per cent. Average increase in total N within each pot at harvest was equivalent to about 138 kg N/ha.
Show more [+] Less [-]Bibliographic information
This bibliographic record has been provided by European Union
