关键词: 随机森林, 随机森林, 烤烟, 香型, 分类

Abstract: The paper aims to explore the effects of phosphorus level on the growth and uptake of nitrogen, phosphorus and potassium of Moringa oleifera, and provide a scientific basis for clarifying the law of nutrient requirement and phosphorus application amount for Moringa oleifera. The mixed matrix of raw soil and coconut chaff were employed to plant Moringa oleifera, the authors observed the differences of phosphorus levels (0, 125, 250 and 375 mg/kg) on the plant height, stem diameter, dry matter ccumulation and root-shoot ratio and analyzed the content and accumulation amount of nitrogen, phosphorus and potassium in the plants. The results showed that: the plant height, stem diameter and dry matter accumulation of Moringa oleifera increased with the phosphorus level increase; each growth index of Moringa oleifera reached the maximum when the phosphorus application amount was 375 mg/kg, the plant height, stem diameter and dry matter accumulation amount was 2.9, 2.6 and 13.8 times as much as that of the non-phosphorus treatment, respectively; besides, phosphate fertilizer could promote root growth and biomass of Moringa oleifera; phosphate pplication level was highly correlated with the growth indexes, the nutrient content and the cumulative amount of nutrient. As a result, 375 mg/kg was the optimal phosphorus level under the experimental conditions, but the optimal dosage of the phosphate fertilizer in production should be further discussed.