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二、双季稻的生育特点与基肥深施和一季晚稻相比,双季稻的显著特点是生育期短。在上海郊区条件下,一般从三麦收获后的五月中下旬开始,到十一月上旬止的约170天时间中,要栽插两季水稻。早稻和后季稻的本田生长期分别为60～70天和100～110天左右。如果再在每季稻的本田生育期中,除去吸肥很少的灌浆期约25天(早稻)和40天(晚粳后季稻),则双季稻的主要
Second, the characteristics of double cropping rice and deep basal application compared with a quarter of late rice, double cropping rice is characterized by a short period of growth. Under the suburban conditions in Shanghai, two seasons of rice are generally planted in mid-to-late May after three wheat harvests and about 170 days before the beginning of November. The Honda growth period of early rice and later rice are 60-70 days and 100-110 days, respectively. If again in the Honda per season rice growth period, remove the fat absorption of grain filling period of about 25 days (early rice) and 40 days (late japonica rice), then the main double-crop rice