双季水稻塑盘旱育抛栽基本苗公式的建立

观察了双季水稻塑盘旱育抛栽秧苗期和大田期分蘖的发生及成穗状况，发现水稻塑盘旱育抛栽不仅存在非同伸蘖现象，且同伸蘖的成穗与湿润水育秧移栽也有较大差异。据此对传统的水稻栽培基本苗公式进行了改进，拟合出了双季水稻塑盘旱育抛栽基本苗计算公式：早稻为X=Y/{(1+t1r1)[1+(N-n-SN)Rr2]+(SN-3-t1)R2r5}；晚稻为X=Y/{(1+t1r1)[1+(N-n-SN)Rr2]+(N-n-SN-3)Rr2R1r3+ (SN-3-t1)R2r5}。其中：X—合理的基本苗；Y—单位面积适宜穗数；t1—单株带的所有分蘖数；r1—单株带的所有分蘖的成穗率；N—主茎总叶数；n—主茎伸长节间数；SN—抛栽时的秧苗叶龄值；R—有效分蘖节位上一次分蘖的发生率；r2— 一次分蘖的成穗率；R1—二次分蘖（除去秧苗所带分蘖上产生的二次分蘖）的发生率；r3—二次分蘖的成穗率；R2—抛栽后非同伸蘖发生率；r5—抛栽后非同伸蘖的成穗率。

Formula about Basic Population under Scattered-Planting with Dry-Raised Seedling in Plastic Trays for Double-Season Rice

The emergence of the tillers and the formation of the panicles during the seedling and field periods under scattered-planting with seedling dry-raised in plastic trays (DPT) in double-season rice were investigated. It was found that there was not only asynchronous tillers, but also great difference in the percentage of the available synchronously tillers with that of the seedlings raised in nursery beds under moist conditions (WB). Hereby, the traditional formula about basic population of rice planting was improved and a formula for basic population under scattered-planting with DPT in double-season rice was drawn up. For early rice, it was X=Y/{(1+t_ 1 r_ 1 )1+(N-n-SN)Rr_ 2 +(SN-3-t_ 1 )R_ 2 r_ 5 }; for late rice, X=Y/{(1+t_ 1 r_ 1 )1+(N-n-SN)Rr_ 2 +(N-n-SN-3)Rr_ 2 R_ 1 r_ 3 +(SN-3-t_ 1 )R_ 2 r_ 5 }. Where, X represents reasonable basic population; Y, no. of fitting panicles per unit area; t_ 1 , number of total tillers per plant; r_ 1 , percentage of the available total tillers; N, total number of leaves of the main culm; n, total number of stretched-out nodes of the main culm; SN, seedling leaf ages at scattering; R, percentage of the emerged primary tillers in available node-position; r_ 2 , percentage of the available primary tillers; R_ 1 , percentage of the emerged secondary tillers(except the secondary tillers of the seedlings); r_ 3 , percentage of the available secondary tillers; R_ 2 , percentage of the asynchronous emerged tillers after scattering; r_ 5 , percentage of the available asychronous tillers after scattering.