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由于研究问题的角度各异,常把农作物一生按各种标准划分为不同的时期或阶段。如,按外部形态变化划分生育时期为出苗期,三叶期等;依生长和发育的不同划为营养生长期和生殖生长期;按营养来源划为自养生长和异养生长两大阶段等等。本文以干物质积累分配为主并联系形态变化,探讨高粱自养生长和异养生长阶段的划分,借此为高粱施肥技术提供科学依据。一、自养生长阶段与异养生长阶段的划分一般认为,“萌发种子从环境中仅能吸收水分,“还不用从外界取得养分”。所以,将种子萌发至长出三片真叶视为自养生长阶段,将三叶至成熟视为异养生长阶段。关于高粱这两个阶段划分的研究很少。有人指出,高粱第一片绿叶的出现,标志着高粱营养的根本转变,叶片展开前,有机体的营养主要依靠
Due to the different perspectives of research problems, crop life is often divided into different periods or stages according to various standards. For example, according to changes in the external shape of the division of fertility period as the emergence, cloverleaf; according to the growth and development of the different zoned for vegetative growth and reproductive growth period; according to nutrition sources for autotrophic growth and heterotrophic growth two stages Wait. In this paper, the dry matter accumulation and distribution are the main factors that affect the sorghum fertilization technology and the morphological changes of sorghum are discussed in order to explore the division of sorghum autotrophic and heterotrophic growth stages. First, the stages of autotrophic growth and heterotrophic growth stage is generally believed that “the germination of seeds from the environment can only absorb moisture,” no access to nutrients from the outside world. "Therefore, the seed germination to grow three true leaves as The autotrophic growth stage, the trefoil to maturity as heterotrophic growth stage on sorghum two stage division of the study is very few.It was pointed out that the emergence of the first piece of sorghum green leaf, marking a fundamental change in sorghum nutrition, leaf expansion Before the organism’s nutrition mainly rely on