论文部分内容阅读
香瓜营养生长过程中,对氮肥的需求较高,砂质土壤溶液中速效氮含量通常成为一种制约因素。常规的砂土氮肥施用方法,常因淋溶、挥发、脱硝而造成大量氮素损失。用滴灌施氮肥,加之作为底肥的氮肥,为满足香瓜各生长发育阶段对氮肥的需要提供了一种方法。进行本研究的目的是为了确定:生长于砂壤土地中的Classic香瓜,在滴灌条件下对每公顷0,67,100公斤氮作底肥及通过滴灌施入每升0,50,100,150毫克氮的反应。要估计氮肥施用效果及改进香瓜在滴灌及塑料覆盖条件下的种植管理方式,需要这种信息。香瓜茎生长、叶面积及叶柄铵(NO_3—N)、氮、钾、钙、镁含量及其产量均因氮肥施用多寡而差别显著,已观察到,对于茎长、叶柄氮、钾、钙、镁含量前期产量及总产量而言,种前施氮(底肥)×种后施氮(追肥)有着高度显著的交互作用。每升150毫克的滴灌施氮处理,在底肥为0公斤/公顷时,得到最大茎长、叶面积及叶柄铵。用可变氮注施比率,即营养生长发育阶段(5月20日至6月19日)每升50毫克,而生殖生长阶段(6月20日至7月19日)每升50毫克,所得产量最高,为每公顷20700个瓜。这些结果表明,用滴灌施氮,其产量要高于用相应量的氮肥作基肥的情况。
During the vegetative growth of muskmelon, the demand for nitrogen fertilizer is high, and the available nitrogen content in sandy soil solution usually becomes a restriction factor. Conventional sand application of nitrogen fertilizer, often due to leaching, volatilization, denitrification caused by a large number of nitrogen losses. Nitrogen fertigation with drip irrigation, combined with nitrogen fertilizer as a base fertilizer, to meet the growth and development of muskmelon on the needs of nitrogen provides a method. The purpose of this study was to determine: Classic melons grown on sandy soils with 0,67,100 kg nitrogen per hectare under drip irrigation and 0,50,100,150 mg nitrogen per liter by drip irrigation. This information is needed to assess the effectiveness of nitrogen application and to improve the management of melon under drip irrigation and plastic cover conditions. There were significant differences in the growth, leaf area and the content of petiole ammonium (NO_3-N), nitrogen, potassium, calcium and magnesium, and the yield of the melon stems due to the amount of nitrogen fertilizers. It was observed that for stem length, petiole nitrogen, potassium, There was a highly significant interaction between pre-planting nitrogen application (N) and post-N application (top dressing) for pre-magnesium production and total production. Drip irrigation at a rate of 150 mg / L resulted in maximum stem length, leaf area and petiole at the base fertilizer of 0 kg / ha. With variable nitrogen injection rates of 50 mg per liter for the vegetative growth phase (May 20 to June 19) and 50 mg per liter for the reproductive growth phase (June 20 to July 19) The highest yield was 20700 melons per hectare. These results show that, with drip irrigation of nitrogen, the yield is higher than the corresponding amount of nitrogen fertilizer as the base fertilizer.