宁夏干旱带油用向日葵水肥耦合效应研究

The Effect of Water-Fertilizer Coupling on Oilseed Sunflower in the Drought Region of Ningxia

在滴灌条件下采用“312-D”最优饱和设计,在宁夏中部干旱带开展油用向日葵氮磷肥施入量和灌水量的大田试验。对油葵产量建立的水肥回归数学模型表明,油葵产量对氮磷水单因素都变现为正效应,增产程度表现为水﹥氮﹥磷。交互作用表现为氮水﹥氮磷﹥磷水,其中磷水交互为负效应。最优水肥用量:纯氮投入量248.03kg/hm^(2),P2O5投入量104.06kg/hm^(2),K2O投入量60 kg/hm^(2),灌水量888.05m3/hm^(2),产量达4 918.15 kg/hm^(2)。与当地农民未进行水肥耦合处理相比,增产29.4%,增收5 287元/hm^(2)。

The water-fertilizer(NP)coupling field experiment for oilseed sunflower was conducted in the drought of middle ningxia under the condition of drip irrigation by“312-D”saturation optimum design.The regressive maths model was set up based on the oilseed sunflower yield.Analysis showed that the effects among these factors were positive on the oilseed sunflower yield with the influenced order as water>N>P,interaction effects influenced order as N and water>NP>P and water,and P and water was negative.The optimum dosage combinations of water-fertilizer coupling:the dosage of N were 248.03 kg/hm^(2),P 2O 5 were 104.06 kg/hm^(2),K 2O 60 kg/hm^(2),irrigation was 888.05 m 3/hm^(2).Yield reached 4918.15 kg/hm^(2),than local yield and income of oilseed sunflower increased by 29.4%and 5287 yuan/hm^(2).