The decomposition of plant materials in soil, along with the factors affecting it, has been frequently studied, and much information has been accumulated. Most reports indicated that the decomposition of organic mater...The decomposition of plant materials in soil, along with the factors affecting it, has been frequently studied, and much information has been accumulated. Most reports indicated that the decomposition of organic materials proceeded more slowly in paddy soil than in upland soil because of the insufficient 02 supply, the lower soil temperature and the weaker activity of aquatic invertebrates in the former as compared with those in展开更多
The clay mineral association, oxides of clay fraction and surface charge properties of 7 soils, which are developed from granite, located at different altitudes of the Tianbao Mountains were studied. Results indicate ...The clay mineral association, oxides of clay fraction and surface charge properties of 7 soils, which are developed from granite, located at different altitudes of the Tianbao Mountains were studied. Results indicate that with the increase in altitude, 1) the weathering process and desilicification of soil clay minerals became weaker, whereas the leaching depotassication and the formation process of hydroxy-aluminum interlayer got stronger; 2) the contents of amorphous and complex aluminum and iron, and the activity of aluminum and iron oxides for soil clay fraction increased; and 3) the amount of variable negative charge, anion exchange capacity and the values of PZC and PZNC also increased. The activity of aluminum and iron oxides, the accumulation of aluminum, and surface charge characteristics and their relation to clay oxides of the vertical zone soils were observed and recorded.展开更多
The “blind-ear” as a Cu deficiency symptom in wheat on upland soils in the hilly area of Zhejiang Province was discussed in this paper.Through 3 years of field experiments,it was elucidated that “blind-ear” in whe...The “blind-ear” as a Cu deficiency symptom in wheat on upland soils in the hilly area of Zhejiang Province was discussed in this paper.Through 3 years of field experiments,it was elucidated that “blind-ear” in wheat plant appeared due to the low level of available Cu in the soils,and the critical value 3 mg/kg for total Cu in the plant at grain filling stage and 1 mg/kg for available Cu(0.1 M HCl)in the soils.A basal dressing of 30 kg/ha of Cu sulfate to the soils could completely eliminate Cu deficiency symptoms,obtain normal grain yield and have residual effect for at least 3 years.展开更多
文摘The decomposition of plant materials in soil, along with the factors affecting it, has been frequently studied, and much information has been accumulated. Most reports indicated that the decomposition of organic materials proceeded more slowly in paddy soil than in upland soil because of the insufficient 02 supply, the lower soil temperature and the weaker activity of aquatic invertebrates in the former as compared with those in
基金Project supported by the National Natural Science Foundation of China
文摘The clay mineral association, oxides of clay fraction and surface charge properties of 7 soils, which are developed from granite, located at different altitudes of the Tianbao Mountains were studied. Results indicate that with the increase in altitude, 1) the weathering process and desilicification of soil clay minerals became weaker, whereas the leaching depotassication and the formation process of hydroxy-aluminum interlayer got stronger; 2) the contents of amorphous and complex aluminum and iron, and the activity of aluminum and iron oxides for soil clay fraction increased; and 3) the amount of variable negative charge, anion exchange capacity and the values of PZC and PZNC also increased. The activity of aluminum and iron oxides, the accumulation of aluminum, and surface charge characteristics and their relation to clay oxides of the vertical zone soils were observed and recorded.
文摘The “blind-ear” as a Cu deficiency symptom in wheat on upland soils in the hilly area of Zhejiang Province was discussed in this paper.Through 3 years of field experiments,it was elucidated that “blind-ear” in wheat plant appeared due to the low level of available Cu in the soils,and the critical value 3 mg/kg for total Cu in the plant at grain filling stage and 1 mg/kg for available Cu(0.1 M HCl)in the soils.A basal dressing of 30 kg/ha of Cu sulfate to the soils could completely eliminate Cu deficiency symptoms,obtain normal grain yield and have residual effect for at least 3 years.
