A Study On Effect Of N P K Fertilization On Ryegrass In Winter Fallow Rice Field

To solve the problems of human and animals compete in China, the grass rice rotation cropping patterns have been widely endorsed and promoted in the transition of binary planting structure to ternary planting structure to accelerate China’s agriculture development, in which the former mainly the traditional simple food and cash crops, the latter a combination of food crops, cash crops and fodder crops.Ryegrass-rice rotation system is an efficient grass crop rotation mode. By planting ryegrass on the fallow rice fields in winter, it ensures not only high-yield rice, but also high-quality livestock feed. This experiment studies the impact of different proportions of nitrogen, phosphorus, potassium, the three major nutrient elements on the indicators and the production of ryegrass, and the efficient fertilization program comprehensively.The test site is located in Xiangshui Village, Ziyang City in Sichuan Province, purple soil, and medium fertility. The experimental design for four each level of the nitrogen, phosphorus, potassium,3level, a total of36in each treatment, three replicates, a total of108residential. Observations of the phonological phases; ryegrass plant height, density, leaf width, the measurement of chlorophyll, production; ground temperature, air temperature, surface20cm volumetric water content, salt content of the amount of measurements. The data analysis is obtained by SPSS and Excel.The results show that:1. A rotation system of nitrogen, phosphorus and potash fertilizer on the dry matter yield of ryegrassThrough36deal with the impact on the yield obtained in nitrogen300kg/hm2, phosphorus less than75kg/hm2potassium0kg/hm2ryegrass production of the highest of11858kgDM/hm2. The linear regression equation was y=4211.77+23.218x1-1.154x2-4.202x3, R2=0.953.2. Ryegrass plant height, density, chlorophyll ryegrass productionRyegrass yield and plant height, density, chlorophyll a linear regression analysis, have equation y=125.526+60.541xl+6.295x2-42.591x3, R2=0.524, P=0.000. Density followed by high chlorophyll content increased by ryegrass fresh water content, so the performance of a negative impact in the production of dry plant height to play a decisive role on the yield, seen by the equation. 3. Economic BenefitsMost cost-effective from an economic point of ryegrass in the N4level the average input-output ratio up to deal with than the highest, the N4level of28, to reach2.8, that is only applied nitrogen300kg/hm2omission of phosphorus, potassium handling4. Other factors on the yieldTemperature can also affect the ryegrass various indicators thereby affecting production. Ryegrass in the winter (December to February), low temperature (2-5℃) plant height, density, chlorophyll has a negative effect, so the impact of the winter period of low temperature on black grass be taken into account.Planting time in advance can reduce the growth time of the first crop of ryegrass in the winter period to reduce the negative impact. Planting ryegrass in mid-September (more than20days in advance of this experiment), in the winter prior to harvest the first crop, can increase the total harvest times, on the basis of this experiment yield2300-2600kgDM/hm2.5. Trends under each harvest fresh stem ratio and yieldThe first crop of ryegrass growth experiences the longest growth time (four months) during winter, resulting in higher plants in vivo accumulation of dry biomass, so the first crop of ryegrass dry matter yield, the minimum ratio of fresh and dry. Thereafter, the temperature rises, dry matter yield decreases and the ratio rises. With the arrival of the ryegrass jointing and booting stages, starting from the second crop, ryegrass dry matter yield increases gradually, the ratio of fresh and dry declines gradually.