Cultivation Techniques Of Interplanted Strong Gluten Wheat With High Grain Yield And Good Quality In Paddyfield

The experiments were conducted in Xuzhou and Lianyungang from 2004 to 2006 to study the formation characteristics of grain yield and quality of interplanted strong gluten wheat variety Yannong 19 in paddyfield. The quality traits of high yielding population with good grain quality, and the optimal plant density, nitrogen (N) application amount and application method were analysed. The cultivation techniques ofinterplanted strong gluten wheat with high grain yield and good quality in paddyfield in Huaibei Area were suggested.1. With the same sowing date,grain yield and protein content of interplanted strong gluten wheat in paddyfield were significantly lower than those of wheat sowed by driller or hand scattering after rice was harvested.Grain yield and protein content of interplanted wheat in paddyfield were similar to or a little higher than those of wheat sowed by driller or hand scattering after rice was harvested when sowing date was different, but wet gluten content was a little lower.2. In interplanted strong gluten wheat, with the increase of plant density at a certain range, spike number and grain number per unit area increased, but grain number per spike and grain weight decreased. Grain yield had a quadratic relationship with plant density, and the most optimal plant density was 315*104plants/ha according to the equation. 3.Under the suitable basic seedling number, increasing N application amount properly could raise spike number per unit area and grain number per spike, which resulted in the rising of grain yield and grain protein content. Increasing the ratio of N applied at elongation stage and flag leaf stage could raise grain number per spike and grain weight, so grain yield and protein content increased.4. Plant N content was greatest at 5th leaf stage,while N accumulation amount was greatest at maturity. Soluble sugar and sucrose contents and C/N ratio in plants had a change of"high-low-high-low", soluble sugar and sucrose contents were greatest at 5th leaf stage, while C/N ratio was greatest at anthesis. Plant N content was high before elongation stage when the ratio of N applied before elongation stage was great, while it was high after elongation stage when the ratio of N applied after elongation stage was great. Applying N at flag leaf stage could promote N absorption after anthesis, which resulted in the increase of N accumulation amount and grain protein content.5.Increasing N application amount and the ratio of N applied at elongation stage and flag leaf stage properly could raise SOD activity and slow down the rising of MDA content in flag leaves, so flag leaf senescence could be delayed, which resulted in the increase of grain yield and the improvement of grain quality in interplanted strong gluten wheat.6. For interplanted strong gluten wheat in paddyfield in Huaibei Area, the conbination of 300*104seedlings/ha, 300kgN/ha and the ratio of basal: tillering: elongation: flag leaf N fertilizer 3:3:2:2 was suggested in order to get high grain yield with good quality.