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把ＥＸＯＴＥＣＨ１００ＢＸ光谱辐射计和Ｐｏｌｙｃｏｒｄｅｒ高速数字记录仪联用，通过对晚稻品种武育粳２号无肥处理本田期的光谱监测，冠层叶色显示出“三黑三黄”的变化节奏。三黑出现的时间是：移栽至分蘖末期，枝梗分化期至颖花分化期，减数分裂期至始穗期；三黄出现的时间是：分蘖末期至枝便分化期，颖花分化期至减数分裂期，始穗至灌浆期。当水稻冠层叶包由黄逐渐变黑时，栽培上应提供充足的氮素，例如水层灌溉，适当追施氮肥等，满足群体氮素代谢对养分的需要。当叶色由黑逐渐褪淡时，应控制群体对氮素的吸收，例如落干，适当搁田等，促使叶片内碳水化合物向茎、鞘或籽粒中的转运。只有使肥水管理措施与水稻冠层的叶色变化节奏有机地统一起来，才能节约农本，夺取高产。
By using EXOTECH100BX spectroradiometer and Polycorder high-speed digital recorder, the canopy leaf color of the late-rice variety Wuyujing No.2 was monitored by the spectrum of non-fertilizer Honda period. The leaf color of the canopy shows the rhythm of “three black, three yellow”. Three black appeared time: transplanting to the end of tillering, branchage differentiation stage to spikelet differentiation stage, meiosis stage to beginning of spike stage. The emergence time of Sanhuang is: from the end of tillering to shoot differentiation stage, spikelet differentiation From the meiosis to the meiosis period, from the ear to the filling stage. When the rice canopy leaves gradually turn black from yellow, adequate nitrogen should be provided on the cultivation, such as water layer irrigation, appropriate topdressing nitrogen fertilizer and so on, to meet the needs of the group’s nitrogen metabolism for nutrients. When the leaf color gradually faded from black, the population should control the absorption of nitrogen, such as falling dry, appropriate field and so on, to promote leaf carbohydrate transport to the stem, sheath or grain. Only by integrating fertilizer and water management measures with the changing rhythm of the leaf color of rice canopy can we save our capital and win high yields.