Studies on Surface-Applied Fertilizer in No-tillage Corn
Y. D. Hsieh and H. Y. Huang
Experiment has been carried out at Tainan and Chia-Yi Hsien corn production area for studying effectiveness of surface applied fertilizer since 1979. A 2 crop-year of 4 locations field trials was made by randomized block design with 4 replications. Nitrogen rate was from 100 to 220 kg/ha; P2O5 from 30 to 90 kg/ha; and K2O from 40 to 80 kg/ha. Based on the results of four experimental site, it may be concluded that the optimum nutrient rates for no-tillage corn on surface applied fertilizer are: N 180 kg/ha, P2O5 60~90 kg/ha; K2O 40~80 kg/ha. The potassium and phosphorous rate required are not in the same range, it may be affected by soil reaction and available P2O5 and K2O content.
Total phosphorus as basal are better than divided into two times applied, which increase corn grain yield 5.6~10.4% in different location, if basal fertilizer applied by drill in 12 cm near seed and 10 cm deep from surface soil that increase grain yield 2.0~11.1%.