Effects of N Additional Fertilization on Nitrogen Absorption and Accumulation and Use Efficiency of Potato Under Mulched Drip Irrigation
Nitrogen absorption, accumulation and utilization efficiency were studied of potato cv. Zihuabai for various treatments of N additional fertilization under mulched drip irrigation conditions. With the application rate of nitrogen increasing, potato nitrogen absorption and accumulation increased, while nitrogen use efficiency and production efficiency decreased. When the application rate of nitrogen was at 270.0 kg/ha, the potato nitrogen content and cumulative absorption reached maximum;when the application rate of nitrogen was at 67.5 kg/ha, the nitrogen use efficiency was the highest;and when the application rate of nitrogen was at 202.5 kg/ha, the production was the highest. Potato production was significantly and positively correlated to N uptake and N use efficiency, but not to N application rate. N uptake was highly significantly and positively correlated to N application rate.
potatomulchingdrip irrigationnitrogen use efficiency
NETL
NSTL
万方数据
维普
