三峡重庆库区施氮水平对塔罗科血橙树体养分、产量品质及土壤理化性质的影响

杨江波,张绩,李俊杰,郑永强,吕强,谢让金,马岩岩,邓烈,何绍兰,易时来

Effects of Nitrogen Application Levels on Nutrient, Yield and Quality of Tarocco Blood Orange and Soil Physicochemical Properties in the Three Gorges Area of Chongqing

YANG JiangBo,ZHANG Ji,LI JunJie,ZHENG YongQiang,LÜ Qiang,XIE RangJin,MA YanYan,DENG Lie,HE ShaoLan,YI ShiLai

表2 施氮量与果实氮、磷、钾带走量的数学关系

Table 2 Mathematical relationship between nitrogen application and fruit N, P2O5 and K2O removal amount

养分 Nutrient 方程 Equation 拐点 Inflection point R 2 P N y =-48.976x 2+65.859x +28.176 0.67 0.89 0.034 P2O5 y =-13.444x 2+17.035x +9.4192 0.63 0.88 0.039 K2O y =-55.59x 2+74.182x +32.222 0.67 0.88 0.045