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马铃薯生长发育对水分的需求量较大,每形成一克干物质,需水约200千克。发芽和幼苗初期,块茎本身所含的水分可满足生长需要,如播种后土壤水分太少,萌动的幼芽不能伸长出土,就会形成许多仔薯。干旱严重时,会造成薯块干缩,轻则幼苗瘦弱,重则不会出苗。孕蕾至开花期是块茎迅速膨大的时期,需水量最大,如果这一时期缺水,会影响块茎的形成,或使块茎表皮的薄壁细胞木栓化,使薯皮老化而被迫成熟。如遇降雨恢复了良好的发育条件,植株光合作
Potato growth and development of the larger demand for water, each forming a gram of dry matter, about 200 kg of water. Germination and early seedling, the tuber itself contains water to meet the growing needs, such as too little soil moisture after sowing, sprouting buds can not stretch unearthed, it will form a lot of potatoes. Severe drought, will cause tubers shrinkage, ranging from seedling thin, heavy will not emerge. Pregnancy buds to flowering stage tubers rapid expansion of the period, the maximum water demand, if this period of water shortage will affect the tuber formation, or tuber epidermal parenchyma cells cork, the potato skin aging and forced to mature. In case of rainfall to restore good development conditions, plant photosynthesis