Cumulative effects of urea and ammonium sulfate on the fourth-year corn grown on Pakchong soil
1989
Amnat Suwanarit | Chairerk Suwannarat | Sodsai Changsaluk (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Soil Science)
Field plot experiment was conducted on a Pakchong series soil (Reddish) Brown Lateritic Group or Oxic Paleustult) at the National Corn and Sorghum Research Center to examine cumulative effects of four repetitive annual applications of urea and ammonium sulfate on corn. The fertilizers had been applied at the rates of 0, 60, 120, 180 and 240 kg N/ha/year. Phosphate fertilizer and zinc chloride were applied as basal fertilizers. Urea and ammonium sulfate produced comparable grain yields, total dry matter and total N-uptake of the fourth-year corn.
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