Nitrogen source evaluation for potato production on irrigated sandy soils

摘要: Ammonium sulfate (AS), ammonium nitrate (AN), urea (U), and calcium (CN) were evaluated as supplemental N sources for sprinkler irrigated potatoes on a loamy sand soil by determining source effects potato yield, quality, recovery of applied in tubers, petiole NO 3 - concentration. At the rate required to maximize yield (224 kg N/ha), 5-year average yields obtained with AS significantly higher than those using AN, U, or CN. Average total tuber AS, CN 59.3, 56.2, 56.5, 54.8 Mg/ha, respectively. Yield differences between AN are likely due greater loss through leaching from -containing sources. This conclusion is supported lower concentrations tubers when used. U suggest that more susceptible used this work. The percentage US1A quality category was not affected source, but cull Our results indicate can be improved use instead production sandy soils. Potato similar