Status Investigation of Fertilizing on Greenhouse Vegetable Production in Yellow River Irrigation Area

By questionnaire investigation and laboratory testing,the status of fertilizer supply based on greenhouse vegetable production was analyzed in Yellow River irrigation area.The results showed that there was a big blindness for application rates of organic manure and chemical fertilizer as well as the amount of irrigated water during the greenhouse cultivation.An increase in organic manure applied coupled with large amounts of chemical fertilizer supplied.Application rates of organic manure was supplied from 52～337t / hm 2.Mean annual nitrogen fertilizer,phosphorus fertilizer and potassium application rates were inputted from 1 165～4 865kg / hm 2,1 079～2 960kg / hm 2 and 631～3 321kg / hm 2,respectively.pH of soil profile in greenhouse cultivation soils was lower than those in open field soils,whereas soil EC was significantly increase in greenhouse cultivation.The soil EC of greenhouse vegetable production collected from Honggu,Gaolan,Jingyuan had exceeded the threshold value of vegetable growth(0.4mS / cm).