【摘要】 对广东省芒果产区215个叶片样本的N、P、K、Ca、Mg含量及相应产量的比较分析结果表明:芒果高产树与低产树的叶片N、P、K含量差异不明显,Ca、Mg含量差异达极显著水平,但低产树养分的离散变异程度明显高于高产树,高产树叶片的N、P、K、Ca、Mg含量处于相对适宜水平,低产树的叶片养分含量对产量的直接贡献较大,高产树的叶片养分对产量的贡献很大程度上依靠养分之间的相互作用。研究认为芒果营养诊断值为:N 1.60%~1.88%、P 0.140%~0.180%、K 0.72%~0.98%、Ca 1.43%~2.15%、Mg 0.147%~0.280%。更多还原

【Abstract】 The analysis result for the content of N, P,K,Ca and Mg of 215 samples of mango leaves in the main produc-tion area of Guangdong province and the comparison for corresponding yield of fruit indicated that the differences between the high-yield trees and the low-yield trees were not significant,the difference in Ca and Mg content were extremely significant.But the degree of disperse variance of the nutrient content in the low-yield trees were significantly higher than that in high-yield trees.The N,P,K,Ca and Mg contents in leave of high-high trees were in adequate levels.The direct contribution of the nutrient content to the fruit yield was higher in low-yield tree,But the contribution in high-yield trees was in high extent rely on the mutual effect between nutrient elements.The adequate values for nutrient diagnosis consequently established were: N1.60%～1.88%、P 0.140%～0.180%、K 0.72%～0.98%、Ca 1.43%～2.15%、Mg 0.147%～0.280%.更多还原