1. The fertility conditions of the rice extra-slipped planting plots The ultra-deep planting rice cultivation method is a cultivation method relying on the ability of rice tillers to control the number of tillers per acre to increase the yield. Therefore, in the ultra-deep-rooted cultivation of rice, it is necessary to select the land with superior fertility, fertilizer retention and water retention. 2. Fertilization principles for rice cultivation in ultra-sparse cultivation Based on the application of agricultural fertilizer and fertility, the base fertilizer should be applied with less N fertilizer, and the fertilizer should be applied or applied as appropriate. Early application of panicle fertilizer in the middle of rice growth. To achieve nitrogen, phosphorus and potassium fertilizers with the application. 3. Fertilizer amount under the fertility conditions in the middle and top, per acre also need to apply farmyard fertilizer 3000-4000 kg, pure nitrogen control in 6.7-8.o kg, pure phosphorus (phosphorus pentoxide) control in 3.0-4.8 kg, pure potassium (potassium oxide) control at 3.4-5.0 kg. Its matching ratio is approximately l:0.5:0.5. 4. Fertilization method applies 30% of the total amount of nitrogen fertilizer per acre after application of agricultural fertilizer, and 50%-70% of the total amount of phosphate fertilizer and potassium fertilizer as base fertilizer. After site preparation, fertilize the whole layer. In the first 7 leaves or 8th leaves of rice, 25% of the total amount of nitrogen fertilizer was used as a control fertilizer. 25% of the total amount of nitrogen fertilizer and 30%-50% of the total amount of potassium fertilizer were used as the first panicle fertilizer at the differentiation stage of the 1st and 2nd branches of rice ear, and 20% of the total amount of nitrogen fertilizer was applied when the color of the leaves turned to be light before heading. For the second panicle fertilizer. A good grasp of the above fertilization methods, coupled with the management of water layer, pest control, etc., can get high yield of rice cultivation.