甘草配方施肥及各元素对光合作用的贡献率

Formula Fertilization of Glycyrrhiza uralensis and Contribution Rate of Vegetative Element for Photosynthesis

采用三元二次正交回归设计进行4 a生甘草施肥试验,探讨不同施肥配比与施肥量对甘草光合作用的影响.结果表明:氮、磷、钾的单因子效应和互作效应对甘草的净光合速率均有很大影响,在相同栽培管理条件下,合理施用氮肥、磷肥、钾肥均可提高甘草净光合速率;施用氮肥对提高甘草光合作用的影响大.氮×磷、氮×钾均表现为正效应,其交叉项分别为0.810 0和0.275 7;磷×钾表现为负效应,其交叉项为-0.550 8.由此说明,氮和磷、氮和钾的有效配比均可促进甘草的光合作用.通过高光合施肥措施中的xi取值频率分布分析频率标准差,得出甘草最佳的施肥配方:N 96.85~104.35 kg/hm2、P2O579.91~88.62 kg/hm2、K2O 73.77~81.56 kg/hm2.

This study attempts to evaluate the effects of nutrient elements and select the optimum fertilizer formulaby applying fertilizer formula of various nitrogen,phosphorus and potassium levels from three-factor quadraticorthogonal regression test to 4-year-old licorice saplings. Results showed that the single factor effects andinteraction effects of nitrogen,phosphorus and potassium on the net photosynthetic rate were greatly affected. Therational application of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer can promote the netphotosynthetic rate under the same cultivation and management conditions. The effect of nitrogen on netphotosynthetic rate was greater than that of phosphorus and potassium. Both N×P and N×K showed positiveeffects,and their cross terms were 0. 810 0 and 0. 275 7 respectively. P×K showed negative effect,and its crossterm was - 0. 550 8. Both the nitrogen and phosphorus appropriate ratio and the nitrogen and potassiumappropriate ratio promoted photosynthesis in licorice saplings. Frequency standard deviation analysis of xifrequency distribution in high photosynthetic fertilization was conducted,the optimum fertilizer formula includedan application of N 96. 85-104. 35 kg/ hm2,P2O5 79. 91-88. 62 kg/ hm2,and K2O 73. 77-81. 56 kg/ hm2.