The us department of agriculture ' s weekly report of plant health revealed a second consecutive decline 据美国农业部苗情周报显示， （美棉）新花苗情连续下降。
2.
The results showed the narrow row spacing can remarkable raise wheat ear numbers and yield 结果表明，相同基本苗情况下，缩小行距放稀株距均能显著提高2个小麦品种的成穗数，增产显著。
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The knowledge model for diagnosis and regulation includes calculation of differences in growth indices , possibility of regulation and intensity of regulation practices 苗情诊断调控知识模型包括生育指标差异、调控可能性分析以及调控强度推荐等。
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The dynamic knowledge model with temporal and spatial characters for cotton management includes three modules as pre - sowing plan design , dynamic development indices , diagnosis and regulation 具有时空适应性的棉花栽培管理动态知识模型主要包括播前方案设计、生育指标动态和苗情诊断调控知识模型三个部分。
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This research investigated the variability and the quantitative relationships among soil nutrients ( soil ph , total n , organic matter , available p ) , growth status ( spad , lai and spad lai ) and yield of rice . all data were analyzed by both classical statistics and geostatistics based on gis . by further integrating gis , gps and crop management knowledge model , a decision support system for precision farming ( dsspf ) was developed , which laid a technical foundation for the practical application of precision farming system 本研究基于gis技术，以经典统计和地统计学为分析手段，确立了田区土壤养分(土壤ph 、全氮、有机质、速效磷、速效钾) 、水稻作物长势( spad 、 lai 、 spad * lai )和产量的空间变异特征及定量关系；进一步以作物管理知识模型为智能决策支撑，提出了gis与模型及gis与gps的组件化集成技术，构建和实现了基于田区作物产量、土壤养分和苗情监测差异的精确农作决策支持系统( dsspf ) ，为精确农作系统的应用奠定了技术基础。
6.
The knowledge model for the dynamics of main development indices as plant height , leaf area index , dry matter accumulation , numbers of fruit branch , square and boll was developed based on the physiological time and target yield and quality . in addition , the dynamic relationships between plant nutrients and dry matter accumulation was quantified . all these sub - models provide the reference standards for quantitative and dynamic growth diagnosis and management regulation 进一步根据产量和品质目标构建了株高、叶面积指数、干物质积累量、果枝和蕾铃数目变化与生理时间之间的动态关系知识模型，初步量化了棉株养分积累量与干物质积累量之间的动态关系，从而为定量化的苗情诊断和管理调控提供了参考标准。
