Study On The Planting Density To The Yield Of The Dwarfed Castor And The Photosynthetic Properties Of Groups

Along with the modern agricultural science and farming techniques development, the planting industrial structure on castor also turns to the development tendency that is dwarfed variety and the cultivated way of rational close planting. But the research on the influence of the planting density on the yield of the dwarfed castor and the photosynthetic properties of groups is really few. Based on this research status, I selected the dwarfed variety CSR6.181, 06 dwarfed castor 1, and the five processing levels during in 21430/hm2-- 45915/hm2, starting with the research on the influence of the planting density on the yield of the dwarfed castor and the photosynthetic properties of groups, seeking the reasonable density of dwarfed castor, provided the theory basis for the application on the field production of dwarfed castor, finally the test result indicated:The single grain's yield decreased along with the increased of the density, and the groups'yield increased at first then decreased. The yield of the group grain assumes the significance difference in the different density processing. Under the density processing of 39798 /hm2, the two varieties'yield reached maximum, respectively are 2040.05 kg/hm2 and 2278.83kg/hm2. Along with the density increased, the contribution of the main ear and the 1st branch ear to the group grains'yield has increased gradually.The different planting densities have certain influence on the various shape indexes of dwarfed castor's mature period. In every shape indexes, the density with the high presents correlation. And with the effective branching, the effective cob number, the long of the main ear present remarkable inverse correlation, and the long of gate pile ear 1, the long of gate pile 1, the long of gate pile ear 2, the long of gate pile 2, the long of main ear, the position of the main stem ear, the stem thickness, the branch and the main stem included angle assumes the inverse correlation.The photosynthesis ability of two dwarfed varieties'from weak to strong and again arrives along with the birth advancement, generally the photosynthesis ability always maintain the high level continuously in the flowering fruit bearing stage. Under the different density processing, the change of the single plant's area, the chlorophyll content and the photosynthesis speed display for the tendency which decreased progressively along with the density increased. And the leaf area index, the total duration of the leaf area assumes the tendency which increased along with the density increased.Under the different planting density processing, the accumulation of the single plant's dry matter increased along with the density decreased. And in the suitable density, the accumulation of the group dry matter increased along with the density increased, but the difference of the distribution rate that is the dry matter accumulation in the underground and aboveground is not remarkable. Processed the dry matter from the flowering stage to the flowering fruit bearing stage in low density, the increased amplitude of the dry matter'distribution rate in the gonophores is relatively large; and processed the dry matter from the flowering fruit bearing stage to the mature period in high density, the increased amplitude of the dry matter'distribution rate in the gonophores is relatively large. The oil content increased basically along with the density increases, the oil yield of the two varieties reach maximum in the 39798 /hm2 processing, respectively are 97.72kg/hm2 and 121.46kg/hm2.According to the influence of the different planting density on the castor's birth, we may think initially that the reasonable planting density of the dwarfed castor which high is between 150cm-160cm is about 39000/hm2-40000/hm2.