养分管理对油麦菜氮磷养分利用率及硝酸盐累积的影响

在云南滇池流域,采用田间小区试验的方法,研究了不同氮磷养分用量对油麦菜(Lactuca sativa var.ra mosa)产量、硝酸盐含量及氮磷养分利用率的影响,以T1～T9分别表示9种处理方法.试验结果表明:①油麦菜产量以T3(N90P126 K180)处理时相对较高,达到28968.75 kg/ha;硝酸盐含量...

Effects of nutrient management on nutrient utilization of N,P and nitrate accumulation in lettuce

By method of the field plot trial, the experiment was carried out in Dianchi Lake basin to study the influence of different nitrogen and phosphorus fertilizing on lettuce （Lactuca sativa var. ramosa） production, nitrate content and nutrient utilization of N, P. 9 treatments were denoted by T1-T9, respectively. The results showed that: ① The lettuce production of T3(N₉₀P₁₂₆K₁₈₀) was higher than other treatments, reaching 28 968.75 kg/ha; except for treatment of T4(N₁₈₀P₁₂₆K₁₈₀)、T5(N₂₇₀P₁₂₆K₁₈₀) and T8(N₁₈₀P₁₈₉K₁₈₀), the contamination levels of nitrate content of the others came out to be Lv.4; after comprehensive consideration on nutrient utilization of N, P, the nutrient utilization of Lettuce showed to be higher after treatments of T4(N₁₈₀P₁₂₆K₁₈₀) and T9(N₉₀P₆₃K₁₈₀) with 17.42%,2.10% and 20.14%,2.05% respectively. ② Under the same amount of potash fertilizer and the treatment of appropriate nitrogen and phosphorus fertilizers match fertilizing, the corresponding lettuce production, nitrate content and N, P fertilizer nutrient utilization were superior to treatments of partial fertilization or high fertilization. Therefore, control of nitrogen and phosphorus fertilizing, reasonable optimization of ratios of nitrogen and phosphorus will improve the nutrient utilization and vegetables quality, which is of great importance for source controlling the agricultural non-point pollution.