Studies On Effect Of N,P,K On Eco-organic Soilless Cucumber Of Growth And Development

Experiments on effect of nutrient N, P and K on cucumber growth, yield and quality were conducted by directly supplying solid N, P and K fertilizer (mixture of .organic and inorganic fertilizers) in eco-organic type soilless culture system, related models between NPK fertilization rate and yield were established by application of two times saturated D-optimal design.The experiments included seedling propagation experiment, spring cultivation experiment and fall cultivation experiment. The results are as follows.The results of seedling propagation trial indicated that N fertilizer influenced strong seedling index greatly and reached remarkable level. P and K fertilizer had a little effect on the index of strong seedlings. N fertilizer had positive effect, but P and K fertilizer had negative effect on the index of strong seedlings.The spring cucumber results indicated that N, ? and K nutrient had significant effect on cucumber early yield. The optimum fertilization rate of N, P and K were 0.83 (unit:g.plant'1 .time'^the same as follows), 0.37 and 0.86 respectively during early growing stage;P and K had significant effect on cucumber middle yield. The optimum fertilization rate of N, P and K were 0.66,0.33 and 0.90 respectively during middle growing stage; N had significant effect on cucumber late yield. The optimum fertilization amount of N, P and K were 0.61,0.40 and 0.94 respectively during late growing stage.The autumn cucumber results showed that early cucumber yield was affected by N fertilizer and the optimum fertilization rate of N, P and K were 0.66, 0.33 and 0.92; middle cucumber yield was affected by NP and PK interaction and the optimum fertilization amount of N, P and K were 0.65, 0.34 and 0.84.