Study On The Influence Of Different Soil Texture To Alfalfa's Growth And Seed Yield

This paper studied on the annual growth of alfalfa planting in the soil nature clay, the clay and the silt loam. It indicated that soil nature clay's relative soil water content in 0-60cm was higher than slit loam's and clay's at alfalfa's squaring stage, flowering stages, pod stage and maturity stage, and the soil temperature was higher in soil nature clay than in silt loam and clay before the beginning of pod stage, it showed that the soil nature clay's water hot synchronism was better than the silt loam and the clay, it was benefit to alfalfa's growth.Seeing from the alfalfa's dry matter allocation process, nutrition growth phase was dry matter transferred to photosynthesis organs and accumulate at first, but dry matter was transferred to generate organ in generating stage. There was evident difference among different soil texture, alfalfa's leaf weight and total dry matter's ratio was higher in soil nature clay than the other soils, growth potential was better, the velocity of alfalfa's leaf, stem and pod accumulating was quicker in soil nature clay than in silt loam and clay. Alfalfa's plant height and stem diameter was lager in the soil nature clay than in the other kind of soil from the morphological structural feature.Soil N content was higher in the soil nature clay than the other two different soil texture, and alfalfa grew better, soil N content was higher in alfalfa's nutrition growing stage than in generate growing stage. Soil P mainly distributed surface in the three kinds of soil texture, but soil P content was lower in subsoil. Soil K content was high in the three kind of soil texture, and K content was highest in clay, K content was higher in the soil nature clay, and there was little in silt loam.N content was highest in alfalfa's leaf in the three kinds of soil texture in different growing stage, P content was highest in blossom (pod), and K content was highest in stem and pod.Alfalfa's seed abortion rate was low in soil nature clay, and the seeding production was highest, it was 525kg/hm2. So the soil nature clay was the suitable kinds of soil texture in carrying through alfalfa's seed breeding.