双季杂交稻“肥促水调”栽培技术的应用

选用优势强、品质优的杂交组合,早季中熟搭配晚季迟熟组合,培育壮秧,控制分蘖肥用量,增大后期施肥量,超前搁田控制苗峰,在一定穗粒基础上,实现总粒数、实粒数和经济系数的大幅度提高,从而提高产量．

Application of "Fertilizer-promoting Water - controlling" Cultural Technique in Double Cropping Hybrid Rice

The technique called "Fertilizer-promoting Water-controlling"was demonstrated in 5.02 ha double cropping hybrid rice fields in 1991 - 1992. The yearly rice yield was 15.08-15.68t/ha, 15.1% - 36.0% higher then that in 1990 when the conventional cultural management was used. This new technique was ex- tended to an area of about 0.13 million ha double cropping hybrid rice fields in Cangnan County, Wenzhou,~an bounty, Wentheu,' and an increase of 25.348 thousand ton paddy was obtained. The main points of the technique includes: (1)Ferti- lizer management on the principle of heavy basal fertilizer, no or a little tillering fertilizer and proper spikelet-promoting fertilizer. The spikelet -promoting fertilizer is generally applied whe the leaf next to flag leaf emerges with 45 - 75kg urea per ha and proper amount of potassium fertilizer. The toltal amount of ferti- lizer applied should be limited within 187.5kg N/ha for the early crop,225kg N/ha for the late rice crop. (2)Water management, When the number of tillers rises to 65% of the expected nuber of panicles the stand- ing water should be drained away and the field be dried to control exmessive tillers, and the reirrigation with shollow water should be done a little advance of the forting stage. (3)Other neccessary techniques i.e. choosing hybrid combinations, with high yielding ability and good grain quality and and arranging medium-maturing ones for the early season cropping and late maturing ones for the late season cropping, raising vigorous seedlings; inte- grate control of diseaes and insect pests.