控释肥料不同用量对黄瓜幼苗生长及养分吸收的影响

 采用生产中常用的草炭︰蛭石（1︰1）为育苗基质，研究了包膜控释肥料（CRF，19-10-11）不同用量对黄瓜幼苗生长及养分吸收的影响，以确定育苗阶段合理的控释肥料用量及基质中适宜的氮素含量。试验共设5个处理，控释肥料用量分别为0、3.42、6.84、10.26、13.68 kg·m^-3，4次重复。结果表明：控释肥料用量在3.42～6.84 kg·m^-3情况下，可为黄瓜幼苗提供充足的氮素供应，同时也可满足植株对磷、钾的需求，植株地上部和根系干物质的累积量、根长及根系表面积较大，与此对应的移栽期基质适宜无机氮含量在292～884 mg·kg^-1之间。根冠比随控释肥料用量的增加而减小。

Effects of Seedling Growth and Nutrient Uptake of Cucumber with Different Rates of Controlled Release Fertilizer

Nutrient management in seedling period is a general problem in China vegetable cropping systems. Excessive or deficient nutrient supply can restrain seedling growth. In this study, traditional medium (vermiculite and turf, 1:1) as seedling substrate, different application rates of controlled release fertilizer (CRF, 19-10-11) were designed to determine proper CRF application rates and optimum mineral nitrogen content of planting substrate for cucumber (Cucumis sativus) seedlings. Shoot and root dry matter accumulating status, root morphology and nutrient uptake of cucumber seedlings were detected in this experiment. Five treatments were conducted in this trial, CRF application rates were 0, 3.42, 6.84, 10.26, 13.68 kg?m-3 respectively. The results showed that nitrogen, phosphate and potassium supplied could meet with cucumber seedlings demand; shoot and root dry matter, root length and root surface area were higher, when the CRF application rates were 3.42~6.84 kg?m-3, optimum mineral nitrogen content of planting substrate ranged from 292 mg?kg-1 to 884 mg?kg-1 at transplanting time correspondingly. The ratio of root to shoot (R/S) decreased with the CRF application rates increasing.