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小麦的养分吸收与施肥(一)小麦发育阶段的生长特点小麦从种子萌发到离乳期(三叶期),幼苗利用种子中的物质生长,称为异养。其后,幼苗即利用本身的根系和叶片吸收养分进行同化作用,称为自养。实质上施用种肥,苗色发绿,说明离乳前也有一定自养能力。为便于了解小麦不同发育阶段营养物质的吸收与转移情况,一般把小麦的发育阶段划分为幼苗期(从种子萌发到三叶期)、营养生长期(从分蘖到起身)、生殖生长期(从拔节到开花)、结实期(从籽粒形成开始到成熟)四个阶段,不同生育阶段的生长情况如图3(原中国农科院作物所资料)所示。
Wheat nutrient uptake and fertilization (A) the growth characteristics of wheat growth stage Wheat germination from the seed to the off-stage (three-leaf stage), the seedlings using the material in the seed growth, known as heterotrophic. Subsequently, the seedlings that use their own roots and leaves to absorb nutrients for assimilation, known as autotrophic. In essence, the application of fertilizer, seedling green, indicating that there must be some self-supporting ability before weaning. In order to understand the absorption and transfer of nutrients at different developmental stages of wheat, the developmental stages of wheat are generally divided into the seedling stage (from seed germination to the three-leaf stage), vegetative growth stage (from tillering to getting up), reproductive growth stage Jointing to flowering), the fruiting period (from grain formation to maturity), the growth at different stages of growth is shown in Fig. 3 (formerly CASS Crops data).