Aqueous extract of cotton has allelopathic effect on Raphanus sativus, Brassica campestris, Lactuca indica, Brassica campestris, Echinochloa crusgall, Setaria viridis and Abutilon theophrasti and its inhibition effect gradually strengthens with increasing concentration. Aqueous extracts from stems, leaves and roots of cotton inhibit or accelerate seed germination and seedling growth, and activity of enzyme of seedling root of cotton. While aqueous extracts from stems and leaves of cotton are 0.02 gmL^(-1), root length, shoot length, lateral root number and dry weight of cotton respectively increase by 10.3%, 3.1%, 22.9% and 2.4% over the control. The above mentioned indexes are lower than the control by 34.4%, 39.2%, 40.6% and 19.0% respectively as the aqueous extracts are 0.1 gmL^(-1). At the same time, root activity and SOD activity decrease by 38.2% and 36.7%, while POD activity and MDA content increase by 52.3% and 36.5%. Growth indexes of plant receptors increase at low concentrations but decrease at high concentrations of aqueous extracts. The allelopathic effect of aqueous extract of stems and leaves is stronger than that of root.

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Main cash crops include cotton, soybeans, peanuts, rape, sesame, ambary hemp, and tea.

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Nigra, B. oleracea and B. carinata belonged to class 2A according to the classification of karyotypes by Stebbins (1971). According to Levitzky's and Stebbin's view, the more asymmetric karyotype a species has, the more evolved it is. Therefore, B. campestris is the furthest evolved species among the elementary species, and B. juncea and B. napus the furthest among the amphidiploid species. Compared with the previous reports, there is no any cytoplasm in the chromosome sample prepared using this protocol which is very useful for the karyotype analysis, as well as the FISH research on Brassica species.

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These five strains were identified as Bacillus cereus黄色α片、Acinetobacter calcoaceticu、Pantoea agglomrans亚洲18一区视频、Pseudomonas putida and Pantoea ananas by 16S rDNA gene sequence phylogenetic analysis, respectively. These bacteria species is the first reported in oilseed rape rape.

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The seedling height and the leaf area increased after treatments.3 Rape seeds were cultured in the solution containing diosgenin of different concentrations. The different concentrations of diosgenin affected metabolism of rape seedlings, particularly at a concentration of 0.5mg/L. The treatments of 0.5mg/L diosgenin increased prominently the contents of soluble sugar, soluble protein and the activity of peroxidase, catalase, Ca2+- ATPase in rape cotyledons.4 Rape seedlings were sprayed with 0.5mg/L diosgenin solution at the two-leaf and one-bud stage.

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It is conducive to uptake soil nitrogen for flue-tobacco on dryland soil with maize-tobacco rotation before topping (60 days after transplanting) and uptake soil nitrogen for flue-tobacco on paddy soil with rice-tobacco rotation after topping.2 The nitrogen utilization efficiency of rapeseed cake, rice straw and rape straw were 19.5%, 15.5%, 8.1% respectively, and the inorganic fertilizer nitrogen utilization efficiency were 41.1%, 42.7% and 35.7% under the combined application of organic additives and inorganic nitrogen fertilizer. The contribution rate of rapeseed cake, rice straw, rape straw to accumulated nitrogen of flue-cured tobacco were 1.0%, 2.4%, 2.7% respectively by the combined application of organic additives and nitrogen fertilizer. Flue-cured tobacco for organic nitrogen absorption meet with the nitrogen needs laws of high-quality tobacco, indicating that the combined application organic additives and inorganic nitrogen fertilizer reduces the nicotine content of tobacco, an increase of sugar/nicotine ratio and improved the quality of tobacco. In which the role of rice and rape straw is greater than the rapeseed cake can be used as measures to lower nicotine.3 Nitrogen accumulation in flue-cured tobacco with the total nitrogen input was a significant positive correlation during the growth stage of flue-cured tobacco. The total nitrogen input for the 156.3-405.5kg.hm-2, in which the soil nitrogen mineralization capacity account for 22.6%-54.3%, with an average of 34.5%, that is, soil nitrogen mineralization accounted for 1/3 of the total nitrogen input.

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The increments of organic matter, total nitrogen and total phosphorus in soil were 3.05~3.06g/kg, 0.06~0.07g/kg and 0.01~0.26g/kg, respectively. Spring wheat-spring highland barley or spring highland barley-winter wheat rotation also was benefited to raise soil fertility.

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This paper presents the present development of rape combine home and abroad and the running principle of typical threshing and separating system. And comparative experimental investigations are done between different threshing and separating systems, such as rasp-bar-plate-tooth drum with grid concave, axial-flow -short-rasp-bar drum with grid concave and spike-tooth drum with grid concave.

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The effect of N forms and Ratios on iron nutrition in hydroponically grown lettuce were investigated. It was found that suitable ratioNO3--N:NH4+-N:CO(NH22 =6:6:0 in nutrient solution can significantly promote plant growth, raise chlorophyll content, improve plant iron utilization efficiency, and reduces nitrate content accumulation in leaves, and the cost of nutrient solution was thus reduced.

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Under the climatic conditions of Chengtu , the opening of the flowers of the.

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