过量浸水对基质块N、P、K流失及秧苗生长的影响

[目的]研究过量浸水对基质块N、P、K流失及秧苗生长的影响。[方法]设计让基质块吸水饱和膨胀后再多加其体积1/2的过量水,并设13个时间梯度用来研究一次性过量浸水与基质块N、P、K养分浸出、损失的回归关系,并种植西红柿研究基质块泡水后对植株养分吸收及生长的影响。[结果]3种养分在浸泡水中的浓度与时间都存在回归方程分别为:N=-2E-05t2+0.016 1t+2.055 3、P=0.002 2t+2.248 5及K=0.004 7t+0.875 8。虽然3种养分都有损失,但氮损失总量与时间的回归方程方差分析差异不显著,这与其挥发性质有关,而P、K的回归方程为:P=0.125 7t-0.117、K=0.022 5t0.1514。这样造成植株地上部对N、K的吸收产生不利影响,回归方程分别为:N=20.64e-4E-04t、K=E-06t2-0.011 3t+29.055。同时,在该试验条件下,过量浸水未对壮苗指数造成显著不利影响。[结论]为指导基质块浸水方式及其栽培管理和育苗提供理论依据,同时指导农业生产。

Impacts of Substrates Plots of N, P and K and Seedling Growth by Excessive Soaking

[Objective] The aim was to study on impacts of substrate plots of N,P,and K and seedling growth by excessive soaking.[Method] Substrate was designed to add additional 1/2 water after saturation and expansion.Disposable excessive soaking and regression relation of nutrition infusion of substrate plots were studied on by design of 13 time gradient.Plant nutrition absorption and growth effects after substrate plots immersed by water were investigated by growing tomato.[Result] Concentration and time of the three nutrition immersed in water had the regression equation of each,as follows: N =-2E-05t2 + 0.016 1t + 2.0553,P = 0.002 2t + 2.248 5 and K = 0.004 7t + 0.875 8.With nutrition loss of the three,however,loss amount was almost same with variance analysis of regression equation,which may be resulted from its volatilization.Regression equations of P and K were: P= 0.125 7t-0.117,and K = 0.022 5t0.151 4,which led to adverse impact on plant absorption of N and K above ground,whose equations were N=20.64e-4E-04t,and K=E-06t2-0.011 3t + 29.055.Meanwhile,under the condition,sound seedling index was not impacted a lot by excessive immersion.[Conclusion] This study has provided theoretical reference for guidance of of substrate plot soaking method,cultivation and regulation,and breeding,as well as agricultural production.