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田间试验结果表明:在速效K含量150.28mg kg-1的土壤上,番茄N、P、K配合施用比N、P配合施用增产11.56%。番茄产量随K素用量增加而增加,但单位K素增产效果则随K素用量增加而递减。经回归统计分析,K素经济效益最佳施肥量为225kg hm-2时,理论产量为113.53 t hm-2,番茄收入2.84×104元hm-2,肥料成本562.50元hm-2,收益2.78×104元hm-2,增收0.23×104元hm-2。在其它条件基本相同情况下,土壤速效K含量120.40mg kg-1时,每公斤K20增产番茄产品63.87kg;而土壤速效K含量176.26mg kg-1时,每公斤K2O增产番茄产品19.16kg。不同处理间差异显著性经LSR检验达到显著和极显著水平。
Field experiment results showed that N, P and K in tomato were increased by 11.56% compared with N and P in soils with available K content of 150.28 mg kg-1. The yield of tomato increased with the increase of K content, but the unit yield of K increased with the increase of K dosage. According to regression analysis, the best yield of K was 225kg hm-2, the theoretical yield was 113.53 t hm-2, the income of tomato was 2.84 × 104 hm-2, the cost of fertilizer was 562.50 yuan hm-2, and the profit was 2.78 × 104 yuan hm-2, an increase of 0.23 × 104 yuan hm-2. Under the same conditions, the effective K content of soil was 120.40mg kg-1, yielding 63.87kg of tomato product per kilogram of K20, while 19.7kg of K2O per kilogram of K2O yielding when available soil K was 176.26mg kg-1. Significant difference between different treatments by the LSR test to reach significant and extremely significant level.