Abstract
The effects of the amount of nitrogen and phosphatic fertilizer applied on the growth and grain yield of two kinds of grain Amaranthus spp. (A. caudatus and A. hypochondriacus) were studied. Soil culture was carried out using 100×200×80 cm frames.
Treatments included a control (N : P : K =8: 8: 8 Kg/10a), application of an excessive amount of nitrogen fertilizer (N: P : K=16: 8: 8 Kg/10a) and application of an excessive amound of phosphatic fertilizer (N: P: K=8: 16: 8Kg/10a) .
The results showed that the application of an excessive amound of phosphatic fertilizer was more effective to an shoot growth compared with the application on of an excessive amound of nitrogen fertilizer and the control, resulting in the increase of branches and grains in the main panicles in both species.
In the case of grain weight, however, the effect of the application of an excessive amound of phosphatic fertilizer was more pronounced followed by the application of an excessive amount of nitrogen fertilizer and the control in A. hypochondriacus while the application of an excessive amount of nitrogen fertilizer was most effective on the increase of grain weight in the lateral branch panicles of A. caudatus followed by the application of an excessive amount of phosphatic fertilizer and the control.
