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一、概况早在1879年 Hughes 就认识到咖啡生产需要钾肥。Anstead 等(1913年)估计生产5吨鲜果(大约一吨净咖啡)要吸收100公斤氮、10。5公斤磷和125公斤钾。Mehlich 计算每公顷种植1330株的3龄咖啡树,生产约1250公斤干豆,其养分总需要量为140公斤氮、14公斤磷、157公斤钾和20公斤镁,约有35%的钾在果实中。
First, an overview As early as 1879, Hughes realized that potash needs coffee production. Anstead et al. (1913) estimated that 5 tons of fresh fruit (about 1 tonne of net coffee) would be required to absorb 100 kilograms of nitrogen, 10.5 kilograms of phosphorus and 125 kilograms of potassium. Mehlich calculated 1330 strains of 3-year-old coffee tree per hectare and produced about 1,250 kg of dry beans with a total nutrient requirement of 140 kg of nitrogen, 14 kg of phosphorus, 157 kg of potassium and 20 kg of magnesium and about 35% of potassium in fruits in.