旱作水稻营养吸收特性的研究

Effect of the Mulches and Other Ecological Factors on Characteristics of the Nutrition Absorption of Rice in Dry Cultivation

研究了不同覆盖物、施氮量、施氮配比对旱作水稻氮、磷、钾养分吸收特性的影响。结果表明 ,水稻覆膜旱作可通过增加施氮量、提高穗肥比例来增加齐穗后叶片、根系中氮素和磷素的含量及茎鞘中钾的含量 ,并提高产量 ;水稻盖草旱作可通过提高分蘖肥比例来增加齐穗后根中氮、磷、钾的含量 。

The characteristics of rice absorbing nitrogen, phosphorus and potassium in dry cultivation were investigated under the different treatments of mulches, the levels and ratios of nitrogen application. The results showed that plastic film mulching, more nitrogen (N∶375 kg/hm 2 ) and higher ratio of panicle fertilizer (tiller fertilizer: panicle fertilizer=4∶6) increased rice yield, and enhanced the content of nitrogen and phosphorus in leaves and roots, and content of potassium in stems of rice after heading. Rice straw mulching relatively increased the content of nitrogen, phosphorus and potassium in roots. Applied middle level nitrogen (N: 225 kg/hm 2), higher ratio of tiller (tiller fertilizer: panicle fertilizer=8∶2) could not only raise the number of productive stems, but also increase rice yield in dry cultivation with mulching rice straw.