谷秆两用水稻202对氮肥的吸收利用

应用~(15)N-尿素研究了谷秆两用水稻202对肥料氮素的吸收利用。结果表明,在施等量尿素的条件下,对照稻308与两用稻202的稻谷性状相似,但202稻草含N量比308(CK)提高37.57％。不同时期施肥,肥料氮在谷、草中的分配率不同,308遵循常规稻的分配规律,而202水稻则有自己的特性,即早期追肥大部分分布于稻穗中,较迟施肥大部分分布于茎、叶中。应用~(15)N标记稻草研究其利用价值,202草粉饲料被草鱼和白鼠的消化率比308草粉(CK)提高13.6％和16.5％,机体的~(15)N回收率比CK提高9.6％和6.0％;202稻草栽培平菇,~(15)N回收率比CK提高19.1％,202稻草有较好的综合利用价值。

UPTAKE AND UTILIZATION OF ~(15)N-UREA IN GRAIN-STRAW OF A DUAL-PURPOSE RICE STRAIN-202

The uptake and utilization of 15 N-urea in a dual-purpose rice strain 202 with grain-straw were studied. The result showed that under equal fertilizing condition the grain characters of strain 202 were the same as that of the control strain 308. The N content in the straw of strain 202 was 37.57% higher than that of CK strain. Strain 308 followed the distribution pattern, in which the N was mostly distributed in panicles when topdressing was done at early stage. N was concentrated in stalks and leaves when the fertilizer was applied at late stage. The utilization of rice straw by animals was investigated by 15N-traced rice straw. The digesting rates of powdered-straw of strain 202 by grass carp and mice were 13.6% and 16.5% higher than that of CK respectively.15N-recovery rates in the both animal bodies when fed with 202 powered-straw were 9.6% and 6.0% higher than that of CK respectively. 15N-recovery rate was 19.1% higher than CK when using 202 rice straw to grow Pleurotus ostreatus. The results indicate that the straw of dual-purpose rice strain 202 is a good material for the comprehensive utilization.