The Spatial Distribution Of The Greater Hinggan Mountains North District Of B And The Determination Of The Critical Value Of Major Crops

Our country is B deficiency is the most serious countries in the world, according to the second soil census data, soil B deficiency area of up to 40% more than in China. Plant B deficiency can lead to "flower and false", severely reduces production of crops. But the boundaries between soil lack of B and B poison is extremely narrow, B direct effect on crop yield and quality. This article through to the greater Hinggan mountains Hulun Buir city effect in the study of the spatial variation characteristics of B, according to the different flag county, different soil types, using different ways and different slope, different soil parent material, different landform parts classify six aspects:statistical analysis to clear the present distribution of local soil effective B content, and analyze the rape, wheat boron fertilizer experiment data, determine the major crops in B threshold, and provide theoretical basis for scientific fertilization.This research through the Hulun Buir city, more than 40000 soil samples measured data through spatial interpolation processing of planar data and 89 major crop B fertilizer experiment data (rapeseed, wheat 40 49, a total of 89) analysis of the results are as follows:1.The greater hinggan mountains north area effective B content difference is bigger, the average level of 0.91 mg/kg, B deficiency of cultivated land area of 135759 hm2, accounting for 26.8% of the total cultivated area of the region, compared with the second soil census, B deficiency area increased by 30228 hm2.Tooth g stone effective B content in flag county average minimum, B deficiency area biggest; Dark brown soil and soil types in the swamp soil effective B content is low, the average area of boron deficiency is one of the biggest chernozem and bog soil; effective B content in the slope of average minimum, boron deficiency area biggest; Flood alluvial material effective B content in the soil parent material average minimum, B deficiency area biggest; Terrain area flood land soil effective B content in the lowest average, valley terrace boron deficiency area biggest; Under different using ways did not differ between the average soil effective B content, but the dry land area is larger, B deficiency area also is the largest.2. The level of soil effective B content can better reflect the soil fertility of B rich deficiency condition and rape yield effect of application of B fertilizer. Then use the Cate-Nelson cross the crossover, determine the greater hinggan mountains north district rape soil B deficiency critical value of 0.62 mg/kg.3. The relative yield of wheat and correlation between soil effective B content is poorer, preliminary specification, wheat for B less sensitive, and the region of soil effective B content enough to satisfy the growth of wheat.