Plant Population Development And Yield Constitutes Of Rainfed Potato Under Micro Ridge With Plastic Cover And Side Planting In North Yinshan Of Inner Mongolia

By using potato Kexin-1 as the material in the research, setting five different planting density to research different group structure for rainfed potato the effect of growth and development, yield formation and nutrient absorption rules under micro ridge with plastic cover and side planting in North Yinshan of Inner Mongolia, results of the research are as follows:1. Potato try matter accumulation rate and potato tuber dry matter allocation proportion, the final yield which form a parabola relationship with planting density, under micro ridge with plastic cover and side planting mode. Rainfed potato suitable planting density is 55476 plant/hm2.2. With the increase of planting density, potato group increase the consumption of water.3. Increasing nutrient uptaking with the growth and development stage of potato group, with the increase of planting density, increasing nutrient uptake amount. But exceeding suitable density, it would decrease uptake of nitrogen, potassium in the late potato growth and development. From potato seeding to starch accumulation stage, the relationship between population LAI and nitrogen, phosphorus, potassium accumulation amount is all conforming to following equation:y=0.3852x0-3708, y=0.7554x0.3660, y=0.2730x0.4548 (y:population LAI; x:population nitrogen or phosphorus or potassium accumulation, kg/hm2).4. By using optical spectrum instrument GreenSeeker to obtain NDVI value, to further estimate potato population LAI, estimating model is y= y=-2.4442x2+5.6558x-0.3643 (y: LAI, x:NDVI value).