Effect of Planting Ways on Boll Development of Transplanting Cotton\= with Middle Maturity Variety in CottonWheat Double Cropping

The results showed that the planting ways had little effect upon the boll weight, fiber enlongation, fiber cellulose accumulation, seed(kernel) protein accumulation and the main fat acid accumulation. In cottonwheat double cropping, 31 model was better than 32 model. It was inadvantage for cotton seed(kernel) fat accumulation that seedling transplanting too early for both planting ways and too late for 31 model. 32 model and 31 model may be chosen for the seedling transplanting cotton with middle maturity varieties.\;