【摘要】 通过田间小区和微区框15N示踪试验,研究了水稻旱作秸秆覆盖、旱作薄膜覆盖、旱作秸秆和薄膜双覆盖、旱作无覆盖与常规灌溉栽培方式的氮素吸收利用特性。结果表明,水稻常规灌溉栽培的氮肥利用率(15.30%)显著低于旱作无覆盖(23.56%)和旱作薄膜覆盖(23.10%);旱作秸秆薄膜双覆盖(19.07%)和旱作秸秆覆盖(18.41%)显著低于旱作溥膜覆盖。旱作水稻根、茎叶、子粒各器官的NDFF值(即各器官N含量来自化肥N所占的百分率)是覆盖栽培小于无覆盖栽培;而旱作栽培普遍高于常规灌溉栽培。旱作条件下,水稻产量覆盖栽培高于无覆盖栽培;无覆盖条件下,常规灌溉栽培显著高于旱作栽培。更多还原

【Abstract】 Character of utilization rate of nitrogen fertilizer of rice by 15 N tr acer techniques were studied under the conditions of dryland rice covered with s traw, plastic film , straw and plastic film, without cover and normal irrigation cultivation of rice in the field. The results showed that the NUR of normal irr igation cultivation(15 30%) was lower than that dryland rice without cover (23 56%)and dryland rice covered with plastic film (23 10%); dryland rice covered with plastic film was higher than that with straw (19 07%) and straw and film ( 18 41%). NDFF value of root, stem and grain under the condition of dryland ric e with cover were lower than that without cover, and the rice dryland cultivation was significantly higher normal irrigation cultivation. Under the condition of dryland, the rice yield with cover was higher than that without cover, however, the yield of normal irrigation cultivation was higher than that dryland under wi thout cover condition.更多还原