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不同氮肥施肥量应用于秦岭北麓山地苹果园,连续八年的试验结果表明其增产效果显著。N_4处理的产量与N_2、N_1处理的产量相比较差异极显著。且N_4处理的果实品质稍好,裂果较轻。三个处理相互比较,八年平均N_2比N_1每增施0.5公斤尿素,可增产苹果8.80公斤,N_4比N_1每增施0.5公斤尿素可增产苹果9.40公斤,经济效益明显.试验结果证明,每株施尿素2—2.5公斤是较适宜的。在这个施肥水平范围内,产量随施肥量的增加而递增。
Different amounts of nitrogen fertilizer applied to mountainous apple orchards in the northern foot of Qinling Mountains, for eight consecutive years of test results show that the yield-increasing effect is significant. The yield of N_4 was significantly different from that of N_2 and N_1. And N_4 treated fruit slightly better quality, split fruit lighter. The three treatments were compared with each other, and the average N_2 of eight years could increase 8.80 kg of apples per 0.5 kg of urea, while N_4 of N_1 could increase the output of apples by 9.40 kg per 0.5 kg of urea compared with N. The results showed that, Applying urea 2-2.5 kg is more appropriate. Within this fertilization level, the yield increased with the increase of fertilizer application.