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[目的]明确柑橘合理的施氮量。[方法]以纽荷尔脐橙为供试品种,设4个处理,分别为不施氮肥(CK)、施氮量0.315、0.450、0.585 kg/株,研究不同氮肥施用量对柑橘农艺性状、产量、果实商品性、经济效益的影响。[结果]氮肥可提高柑橘农艺性状,使平均单株果数增加44.6~66.2个,平均单果重增加13.7~27.3 g,果实纵径和横径分别增大1.9~3.7、2.9~4.0 mm;可提高柑橘产量,增产率为21.94%~57.99%;特等果和一等果重量明显增大,增幅分别为14.93%~27.62%、38.91%~42.58%;随着施氮量的增大,果实品质和经济效益反而有所下降。[结论]综合柑橘的农艺性状、产量、商品性及经济效益,适宜的施氮量为0.450 kg/株。
[Objective] The research aimed to clarify the reasonable nitrogen application rate of citrus. [Method] With Newhall navel orange as the tested varieties, four treatments were applied, including no nitrogen fertilizer (CK), nitrogen application rates of 0.315,0.450 and 0.585 kg / plant respectively. The effects of different nitrogen fertilizer rates on agronomic characters, yield , Fruit commodity, the impact of economic benefits. [Result] Nitrogen fertilizer could improve the agronomic characters of citrus, which increased the average number of fruit per plant by 44.6 ~ 66.2, the average weight per fruit increased by 13.7 ~ 27.3 g, and the longitudinal and transverse diameters increased by 1.9 ~ 3.7 and 2.9 ~ 4.0 mm respectively Increase the yield of citrus, the rate of increase is 21.94% ~ 57.99%; the weight of special fruit and first fruit obviously increases, the increment is 14.93% ~ 27.62%, 38.91% ~ 42.58%; with the increase of nitrogen application, the fruit quality And economic benefits have declined. [Conclusion] Based on the agronomic characters, yield, commerciality and economic benefits of citrus, the suitable nitrogen application rate was 0.450 kg / plant.