英文: An optimum planting density must be employed to get a high yield, depending upon soil condition, varietal tillering
ability, fertilizer level, number of plants per hill, and planting season.
英文: At Fuyang, deep water method instead of soil drainage was used, the water layer about 10 cm thick was kept for some days near maximum tillering
stage, this could result in deterioration of soil environmental condition for rice growth at late stages.
英文: For example, plant K content in seedling stage is usually less than 3 %, while during the period from plant transplanting to maximum tillering
stage, plant K content reaches to a peak value (more than 4%), high K content in this period is favorable for ph
英文: For late rice, we should pay attention to seedling and tillering
stage, supply certain amount at middle stage, if soil K deficiency is severe.
英文: In general, total amount of K, Si uptake by plant increase with plant growing, the maximum content of potassium appeared at maximum tillering
stage, the maximum content of silicon appeared at ripe stage.