Research On Yield And Nitrogen Fertilizer Use Efficiency Of Double Rice Under Different Nutrient Management Models

Using on Luliangyou996,C-liangyou396 as provided materials, choosing middling fertility field for experiment, set up 5 treatment models, which are: fertilizer model without N, farmers-familiar fertilizer model, the optimal-nutrient management model, super-high-yield model, super-high-yield and high-efficient model, various forms of nitrogen nutrition on yield and nitrogen use efficiency for early rice and late rice were studied. The results showed that:1. Plant height,tillering number test shows that, farmers-familiar fertilizer model take good effect for rice nutrient supply at the beginning time, under use N, P and K fertilizer balance, the treatment 3 and 5 have a better growing condition and higher tillering quality, conducive to the assimilation of rice, increasing yield.2. Organic fertilizer takes great effect to improve the root activity and root elongation for rice. Comparing with use fertilizer separately, Organic and inorganic fertilizer use together could obviously improve root activity.3. Dry weight per plant change slowly from transplanting period to tillering period, model 2 take high dry weight per plant at the tillering period, but with low nutrient providing in late growth stage, high dry weight per plant improve low at the reproductive growth stage. Although with lower fertilizer application, use of inorganic fertilizer and organic fertilizer together and reasonable can take rapid increasing for high dry weight per plant in the reproductive growth stage, which indicates that, under balanced application of NPK fertilizer, use basal, tillering, panicle divided by a certain percentage has better effect than use of basal tillering fertilizer separately.4. Under same level of nitrogen fertilizer, yield of treatment 5 was larger than treatment 2; with lower nitrogen fertilizer application, yield for treatment 3 is higher than treatment 2. Compare with blank treatment, the yield of early and late rice increasing 21.78%-43.18% by each treatment. Yield affect factors results show that: appropriate enhance application of panicle fertilizer can increase the rice grains per panicle and seed setting rate. With application of micronutrients, NPK fertilizer applications reasonability is also important to increase the ears and ensure the quality and spike, which can also improve the quality of rice.5. Under balance application of NPK fertilizer, application of organic, inorganic fertilizer together could significantly increase rice yield and nitrogen efficiency, basal, tillering, panicle fertilizer divided by a certain percentage can also increasing the rice yield.