The effect of yield and grain protein content with soil water content and nitrogen (or nitrogen and P2O5) was described by isopleth.

 
  • 用極差變換將產(chǎn)量和蛋白質(zhì)含量理論值標準化,其標準值曲線(xiàn)的交點(diǎn)即為二者的最佳結合點(diǎn)。
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