摘要
在当前的土壤肥力、肥料、劳力等生产条件下,双季稻地区到底是普遍发展三熟制,还是两熟?采用什么样的复种、轮作方式,既能作到充分用地,又能积极养地,既能稳产高产、增产增收,又能趋利避害?这是南方双季稻地区急需解决的问题。为此,我们从1977年至1979年进行了连续三年的试验研究。
(1)The cultivation of Chinese trumpet creeper in the winter double cropping rice field could increase the soil fertility and provide more N,P,K nutrition for the growth of early rice giving a promotion to its yield by 21.1%.But no effect was laid on the late rice production.By cultivation of early rice,the content of the soil organic matter decreased obviously.Although it may be increased after the late rice cultivation,the accumulation of organic matter is not significant within a whole year.(2)The winter cultivation of winter beans could give one more harvest of crop and increase soil fertility.As the straw of bean used as green manure,the production of early rice can be increased by 14.4%.(3)The winter cultivation of rape is not only get an additional oil crop but also favovrable to the soil fertility.(4)By the cultivation of wheat in winter,the yearly production of rice decreased to 19.3%,the labour productivity decreased to 44.2%(for cereals)and 82.5%(for cash).The content of organic matterand total nitrogen,especially the content of quick effective nutrients decreased obviously.Even if the total production can be raised by the fertilization doubled,the labour and fertilizer productivity would be decreased obviously,and the cost increased highly,If the total amount of fertilizers for two crops were divided for three crops,the yield loss of three crops(wheat-rice-rice)would outweigh the gain.
作者
肖恕贤
Xiao Shu-shen(Institue of Agricultural Sciences of Liuchow District,Kwangsi Zhun Autonomous Region)
出处
《中国农业科学》
1980年第2期59-66,共8页
Scientia Agricultura Sinica
