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砂姜黑土10年定位试验结果表明:施肥是砂姜黑土小麦增产的关键,N肥增产贡献率为69.4%,P肥增产贡献率为23.3%,K肥为7.3%。P、K肥的肥效随时间的推移逐渐提高。凡施肥处理土壤有机质含量都有所提高,施P处理土壤速效P含量提高幅度较大,每年每公顷施135kg K2O尚不能满足一年两季作物的高产需求,应适当提高K肥用量。
The results of 10-year positioning experiments showed that fertilization was the key factor for yield increase of Shajiang black soil. The contribution rate of yield increase of N fertilizer was 69.4%, that of P fertilizer production was 23.3% and that of K fertilizer was 7.3%. P, K fertilizer fertilizer over time gradually increased. The content of soil organic matter in fertilization treatments increased. The content of available P in soil increased greatly. The annual application of 135 kg K2O per hectare could not meet the demand for high yield of crops in two seasons. The amount of K fertilizer should be properly increased.