Yielding Ability in Direct Seeding Rice Culture in Northeast Thailand
Yielding Ability in Direct Seeding Rice Culture in Northeast Thailand
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泰国东北部直播水稻栽培的产量能力
DOI：
10.11248/jsta1957.42.248
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Kono
中科院分区：
文献类型：
--
作者：
S. Miyagawa;S. Konchan;Y. Kono
在泰国东北部，1994年在24个直播和45个移栽地块，1995年在41个直播和62个移栽地块分别调查了水稻产量及其构成因素。在1994年干旱年份，直播地的平均产量低于移栽地，而在1995年降水丰沛的年份，直播地与移栽地的平均产量差异不大。在水浇地，直播法和移栽法的产量在两个年份都没有显著差异。1994年将A类（最易受旱）和B类（较不受旱和受涝）雨养稻田的产量值汇总，直播水稻的平均产量低于移栽水稻，原因是每穗颖花数和每m2颖花数较少。直播方式的籽粒产量除与小穗数呈极显著正相关外，还与秸秆重、秆长呈极显著正相关。因此，通过补充灌溉、施肥、早播和适当育种，获得更丰富的营养生长和更多的每穗颖花数，是改善直播稻栽培的必要条件。
In Northeast Thailand, rice grain yield and its components were investigated in 24 direct seeded and 45 transplanted plots for 1994, and 41 direct-seeded and 62 plots transplanted for 1995, respectively. Mean yield of direct-seeded plots was lower than that of transplanted plots in the drought year of 1994 while such difference between the two planting methods was not observed in 1995, a year with abundant rainfall. In irrigated fields, yield of rice in the direct seeding method was not significantly different from that in the transplanting method in both years. In the rain-fed paddy fields of A type (most vulnerable to drought) and B type (less vulnerable to drought and flood), mean yield of rice in the direct seeding method was lower than that in the transplanting method when yield values of both types were pooled in 1994, because of the smaller number of spikelets per panicle and spikelets per m2. Grain yield in the direct seeding method showed a significant positive correlation with straw weight and culm length, besides the number of spikelets. Therefore , more profuse vegetative growth and a larger number of spikelets per panicle obtained by supplemental irrigation, fertilizer application , early planting and appropriate breeding are necessary for improving direct seeding rice cultivation.