Study on physiological effect and fertilizer utilization rate of controlled release nitrogen fertilizer for pepper

Soil culture and field biological experiment was used to study the influence on growth, morphological index, yield and fertilizer utilization rate of pepper(Capsicum annuum L.)with different nitrogen fertilizers, and the effect of fertilizer on yield and qualities of pepper in two planting methods with and without plastic film covering.The results showed that urea formaldehyde (UF) had the highest rate of absorption and utilization, ie 44.4%, increased 17.46% ～46.05% compared with other fertilizer The order of increasing yield of fertilizers was UF CO(NH2)2 NH4NO3 NH4HCO3 Yield of UF treatment was 1.88 times that of CK, the index of length, width of fruit weight per fruit and fruit rate of pepper increased markedly compared with the other treatments The yield was positively related to UF rate, when UF rate was 600kg/hm2, the yield and economic benefit were higher, and fertilizer benefit dropped with UF in excess Compared covered plastic film with uncovered soil planting in same rate of UF, the treatment of covered plastic film planting increased yield range by 15.16% to 16.45%, and the contents of total sugar and vitamin C increased with the increase of UF, but the effects on dry matter and total acidity were smaller