土壤硼在油菜生长季节的动态研究

在鄂湘七种旱地土壤的土培试验基础上，进行土壤热水溶性硼（Ｈｏｔ－ｗａｔｅｒ ｓｏｌｕｂｌｅ－Ｂ，简称ＨＷＳＢ），甘露醇硼（Ｍａｎｎｉｔｏｌ－Ｂ）和盐酸羟胺硼（ＮＨ２ＯＨ．ＨＣｌ－Ｂ）在油菜生长季节变化规律的研究。结果表明，从移栽前到油菜初蕾期到盛花期，随着生长季节的延伸，ＮＰＫ处理的ＨＷＳＢ含量呈不断上升趋势，而ＮＰＫ＋Ｂ处理，则先明显下降，后稍许呈上升趋势；Ｍａｎｎｉｔｏｌ－Ｂ大两处理上均呈不断

STUDY ON DYNAMICS OF SOIL BORON DURING RAPE GROWING PERIODS

Based on a pot experiment conducted with seven upland soils collected from Huhei and Hunan Provinces,a research was made on the dynamics of hot-water soluble boron(HWSB),Mannitol-B and NH₂OH·HCl-B during rape growing periods.The results showed that from before rape transplanting to flower-bud appearing,then to fully blooming,the content of HWSB in the treatment without boron had a tendency of constant increase,but that in the treatment with boron went up slightly after it had decreased obviously.And the content of Mannitol-B tended to keep increasing in both the treatments.At the same time,the content of NH₂OH·HCl-B tended to be stable.The relationships among the three kinds of soil boron were that Mannitol-B and HWSB could transform with each other under the effect of environmental factors;NH₂OH·HCl-B and HWSB were fundamentally the same boron fraction,which was due to that the soils were acidified and the Mn oxyhydroxides were reduced strongly after the several planting experiments.For the same reason,relationship between Mannitol-B and NH₂OH·HCl-B in the experimental soils weakened compared to that in the primary soils.