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对15龄的中粒种咖啡无性系30和149施用氯化钾、硫化钾和咖啡壳灰,用量都为K_2O57、114、115克/株,于1981年5月施用,9月再施一次,第一次施用氯化钾后,叶片的氯含量马上增至3000ppm;第二次施用氯化钾达到>4000ppm;无性系30的叶片氯含量比149的高。另一个试验表明,无性系126叶片的氯含量当超过7000ppm时,叶片即坏死。近海的咖啡园氯临界值较低。高用量施硫化钾,叶片的氮、硫、磷、钾、钙和
Potassium chloride, potassium sulfide and coffee shell ash were applied to 15-year-old Mesocarp clones 30 and 149 in amounts of K 2 O 57, 114 and 115 g / plant, applied in May 1981 and again in September, After the first application of potassium chloride, the chlorine content of the leaves immediately increased to 3000 ppm; the second application of potassium chloride reached> 4000 ppm; the leaf content of clones 30 was higher than 149. Another experiment showed that when the chlorine content of clonal 126 leaves exceeds 7000 ppm, the leaves become necrotic. Offshore chlorofluorocarbons have lower criticality. High doses of potassium sulphide, leaf nitrogen, sulfur, phosphorus, potassium, calcium and