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作 者:赵九洲[1]
机构地区:[1]江西财经大学资源与环境管理学院,江西南昌330032
出 处:《江西农业大学学报》2005年第4期553-556,共4页Acta Agriculturae Universitatis Jiangxiensis
基 金:南京市科技发展计划资助项目(99203)
摘 要:试验研究了大花蕙兰优化施肥技术,在不同施肥水平和不同NPK比例下,测定了叶面积增长速率(LAIR)、叶绿素含量(Chl)、光和速率(NPR)和单枝小花数量(FNPR)。结果表明,LAIR与NPK的回归模型为:Y^1=209.664+9.170x1-0.216x2+3.138x3-6.382x21-14.752x22-2.297x23+1.352x1x2+1.718x1x3+1.952x2x3,影响营养生长的限制因子为N素营养,方程求解得N=519.316(mg/L),P2O5=393.4847(mg/L),K2O=661.072(mg/L)时获得的最大的叶面积增长率。过多施用N素,叶片生长速度快,叶面积大,但叶片过长,影响观赏和商品价值,营养生长期控制N素用量以N453(mg/L)为宜,ρ(N)∶ρ(P)∶ρ(K)=1.7∶1.5∶1。FNPR与NPK的回归方程为Y^7=14.771-1.030x1+2.737x2+0.625x3-0.497x21-0.249x22+0.531x23-0.030x1x3-0.263x2x3。影响FNPR的关键因子是P素。在植株生长进入生殖生长阶段,及时调整NPK比例,适宜的N素浓度为N=196(mg/L),P2O5=648(mg/L),K2O=241(mg/L)ρ(N)∶ρ(P)∶ρ(K)=1∶3.3∶1.2时形成最优组合,获得更多的单枝花朵数量。In this experiment the optimized fertilization for Cymbiduim was carried out by saturated design of N,P,K. The leaf growth rate (LGR), the fresh weight (FW), chlorophyll content (Ch1), net photosynthesis rate (NPR) , flower number per rachis (FNPR) were tested. The result showed that the regression model of NPK and LGR was :Y1 =209. 664 +9. 170x1 -0. 216x2 +3. 138x3 -6. 382x1^2 - 14. 752x2^2 -2. 297x2^3 + 1. 352x1x2 + 1. 718x1 x3 + 1. 952x2x3 ,in which nitrogen (N) was the most important key factor which limited leaf growth, and the practical N concentration was 453 (mg/L) ,ρ(N):ρ(P):ρ(K) = 1.7: 1.5: 1. It had the largest flower number per rachis with N : P : K = 226:453 : 300, the regress equation : Y1 = 14. 771 - 1. 030x, + 2. 737x2 + 0. 625x3 - 0. 497x1^2 - 0. 249x2^2 + 0. 53 1x3^2 - 0. 030x1x3 - 0. 263x2x3 in which phosphorus (P) was the most important key factor which limited flowering. The optimized combination of N,P, K was N = 196(mg/L), P205 = 648(mg/L) and K2 0 = 241 (mg/L), i.e. N: P: K = 1 : 3.3: 1.2, which yielded the largest FNPR.
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