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通过对两系杂交粳稻70优双9的栽插密度和施肥的试验研究，总结出该组合的适宜栽插密度和施肥组合措施为：45穴／m2，每穴栽1～2本基本苗；氯化钾75kg／ha作基肥；尿素412．5kg／ha，其中，基肥150kg／ha，返青肥112．5ka／ha，促花肥和保花肥各75kg／ha。这样产量可达8250kg／ha以上。
Based on the experimental study on the planting density and fertilization of two-line hybrid japonica rice 70 You Shuang-9, the suitable planting density and fertilization combination of the combination were summarized as follows: 45 holes / m2, 1-2 seedlings per hole; Potassium chloride 75kg / ha as basal fertilizer; urea 412.5kg / ha, of which 150kg / ha basal fertilizer, 112.5ka / ha fertilizing fertilizer and 75kg / ha fertilizing fertilizer and preservative fertilizer respectively. This yield up to 8250kg / ha above.