The Influence of Different Nutrient Solution on the Cucumber Growth Development and Its Economic Efficiencyin Greenhouse Soiless Cultune

The possibility of substitution of chemical fertilizers for chemical reagents to compound a nutrient Solution for soilless culture and the effects of different formulas on growth and development, yield formation, and the content of minerals in greenhouse cucumber were studied.The results showed that using chemical fertilizers as mineral sources of NS can reduce the costs and increase their economical efficiency. In spring -summer season the vegetative growth of root and top were increased significantly, and the earlier yield was raised when the NH₄-N ratio in nutrient solution was higher. But Various NS had no apparent effect on the growth and development of cucumber in autumn-winter season in greenhouse. The totoal yield of cucumber was higher when the proportion of NH₄-N in NS was suitable. The vegetative and reproductive growth in cucumber plant increased both in spring-summer and in autumn-winter season when NO₃ and urea were used as a N source in the meantime. Meanwhile, the N, P content was in creased, and the k content was reduced in the leaves by raising the puoportion of NH₄-N in NS. The influences of different nutrient solution on the chlorophyll content, photosynthesis, and amino-acis content in cucumber leaves have been studied.