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为探索柑橘对氮肥总需求的合理配方,选用椪柑8306品系作为试验对象,配方拟定依据土壤养分含量、当地农民施肥习惯和参考临县柑橘施肥配方等方法,试验采用“2+X”单因子试验,每小区椪柑树4株,实行动态施肥,设四个处理三次重复,即:处理1(MN_0P_2K_2)无氮区,处理2(MN_1P_2K_2)70%优化氮区,处理3(MN_2P_2K_2)优化氮区,处理4(MN_3P_2K_2)130%优化氮区;施肥时期分基肥、春肥、壮果肥,田间管理按当地习惯。经试验获悉:优化氮区产量最高为3 051.3kg/亩,比无氮区(2 379.7kg/亩)亩增671.6kg,增幅22%;其次是130%优化氮区和70%优化氮区,产量分别是2 996.4kg/亩和2 824.3kg/亩,分别比无氮区亩增616.7kg和172.1kg,增幅20.6%和5.7%;优化氮区单果重、果实横纵径、可食率、VC含量均优于其它小区;优化氮区和70%优化氮区经济效益表现较好。
In order to explore the reasonable formula of citrus total demand for nitrogenous fertilizer, the Citrus 8306 strain was selected as the test object. The formula was formulated based on the soil nutrient content, local farmers’ fertilization habits and reference to the citrus fertilizer formula of Linxian County. The test was conducted using “2 + X” According to the factor test, 4 plants were selected for each plot. Dynamic fertilization was carried out. Four treatments were repeated three times, namely: nitrogen-free zone of treatment 1 (MN_0P_2K_2), nitrogen-optimized zone of 2 MN_2P_2K_2, treatment of optimized nitrogen of MN_2P_2K_2 District, treatment 4 (MN_3P_2K_2) 130% of the optimized nitrogen area; fertilization period base fertilizer, spring fertilizer, fruit fat, field management according to local custom. The results showed that the highest yield of optimized nitrogen area was 3 051.3 kg / mu, increased by 671.6 kg or 671.6 kg compared with no nitrogen area (2 379.7 kg / mu), followed by 130% of optimized nitrogen area and 70% of optimized nitrogen area, The yield was 2 996.4kg / mu and 2 824.3kg / mu, respectively, increasing by 616.7kg and 172.1kg respectively, up 20.6% and 5.7% VC content is better than other communities; optimized nitrogen area and 70% nitrogen optimized economic performance better.