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采用最优化设计安排了氮磷钾三因素五水平(分别为氮:0.0,0.5,1.0,1.5,2.0;磷:0.0,0.3,0.6,0.9,1.2;钾:0.0,0.4,0.8,1.2,1.6g/桶)的肥料试验,供试土壤有效氮、磷缺乏。研究结果表明,氮、磷配合适宜的N_3P_3K_1,N_2P_4K_4及N_1P_3K_3氮磷钾肥利用率较高或最高,氮过多磷不足则氮肥利用率低,导致氮肥浪费并且抑制杉苗生长和生理活性;磷肥可明显促进杉苗对氮肥的吸收。多数生长、生理指标与杉苗针叶全氦、全磷、全钾之间存在显著的二次抛物线关系,据此进行营养诊断可得到较客观的结果。采用综合诊断施肥法(DRIS)可诊断杉木各苗期的营养平衡状况及定量地判断需肥程度和顺序,合理制订各苗期针叶养分的适宜比值。这两种方法相结合得到了一个较完整的杉苗营养诊断指标体系。
The three factors and five levels of N, P and K were arranged by optimal design (respectively nitrogen: 0.0,0.5,1.0,1.5,2.0; phosphorus: 0.0,0.3,0.6,0.9,1.2; potassium: 0.0,0.4,0.8,1.2, 1.6g / barrel) fertilizer test for soil available nitrogen and phosphorus deficiency. The results showed that nitrogen and phosphorus with the appropriate N_3P_3K_1, N_2P_4K_4 and N_1P_3K_3 N, P and K fertilizer utilization rate is high or highest, nitrogen is too low phosphorus and nitrogen fertilizer utilization rate is low, resulting in nitrogen waste and inhibit the growth and physiological activity of fir seedlings; Significantly promote the seedling nitrogen fertilizer on the absorption. Most growth and physiological indexes have significant quadratic parabola relations with the total helium, total phosphorus and total potassium in the needles of Fir spruce seedlings, so nutritional diagnosis can get more objective results. Using the method of integrated diagnosis and fertilization (DRIS), we can diagnose the nutritional balance of Chinese fir seedlings at each seedling stage and quantitatively determine the degree and order of fertilization. The combination of these two methods has resulted in a more complete index system for nutrition diagnosis of fir seedlings.