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Evaluation of the dynamics of the leaf area index (LAI) of rice in farmer's fields in Vientiane Province, Lao PDR
Journal of Agricultural Meteorology ( IF 1.3 ) Pub Date : 2017-01-01 , DOI: 10.2480/agrmet.d-14-00021
Yoshihiro HIROOKA 1, 2 , Koki HOMMA 1, 3 , Masayasu MAKI 4, 5 , Kosuke SEKIGUCHI 4 , Tatsuhiko SHIRAIWA 1 , Koshi YOSHIDA 6
Affiliation  

Rice is the most important crop in Lao People’s Democratic Republic (Lao PDR). The improvement of its productivity is strongly recommended, but information about its growth characteristics in farmers’ fields is limited. This study evaluated the dynamics of the leaf area index (LAI) and analyzed the relationship between the rice productivity and soil in farmers’ fields in Vientiane province, Lao PDR. Because the LAI in the farmers’ fields increased almost linearly, a straight-line regression was used for the analysis. The rice yield in the farmers’ fields ranged from 63.8 g mto 411.8 g mand correlated with the LAI during the later growth stage. The variability in the LAI was explained by the LAI growth rate but rarely by the effective accumulated temperatures from the estimated transplanting date. The LAI growth rate was associated with the nitrogen and carbon content in the soil. These results suggest that the rice productivity in farmers’ fields is governed by the soil fertility through LAI growth, and that LAI monitoring is an effective tool to evaluate the production.

中文翻译:

老挝万象省农田水稻叶面积指数(LAI)动态评价

水稻是老挝人民民主共和国(老挝人民民主共和国)最重要的作物。强烈建议提高其生产力,但有关其在农田中生长特征的信息有限。本研究评估了老挝万象省叶面积指数 (LAI) 的动态,并分析了水稻生产力与农田土壤之间的关系。由于农田的LAI几乎呈线性增长,因此采用直线回归进行分析。农民田间水稻产量从 63.8 g m 到 411.8 g 不等,与生长后期的 LAI 相关。LAI 的可变性由 LAI 增长率解释,但很少由估计移植日期的有效累积温度解释。LAI 的生长速率与土壤中的氮和碳含量有关。这些结果表明,农田水稻生产力受土壤肥力通过 LAI 生长控制,而 LAI 监测是评估产量的有效工具。
更新日期:2017-01-01
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