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Identification of drought-resistant soybean varieties plays an important role in laying the foundation of genetic basis of existing soybean varieties and breeding breakthrough varieties. Soybean drought resistance identification methods (natural field in the condition of drought identification, artificial water control identification, laboratory identification), estimated indexes (agricultural traits index, canopy wilting index, soybean root morphology index, soybean sprout index, physiological and biochemical index) and evaluation methods (directly and comprehensive evaluation), etc. were summarized in this paper to provide reference for the research on drought resistance, breeding and production of soybean drought resistant varieties. [ABSTRACT FROM AUTHOR]

【Objective】 To research the weeds control effect of different kinds and dosage of herbicides in spring maize whole-stalk and zero-tillage field.【Methods】 Four types of herbicides, i.e. 50% acetochlamine, 48% ethyl atrazine, 41% isopropyl atrazine, and 42% Butachlor·Metolachlor·Atrazine, were tested by random group in the field to research the control effect and yields of 4 herbicides on weeds in spring maize field.【Results】 The best treatment effect was 42% Butachlor·Metolachlor·Atrazine at 1 500 mL/hm², the control effect for monocotyledon weeds was 72.0%, dicotyledon weeds was 85.4% after 42 d, the inhibition rate of fresh weight of monocotyledon weeds was 70.0%, the inhibition rate of fresh weight of dicotyledon weeds was 80.6%, and the yield was 11 390 kg/hm².【Conclusion】 It is recommended to use 42% Butachlor·Metolachlor·Atrazine at a dose of 1 500 mL/hm² in spring maize zero-tillage field covered by whole stalk in Changzhi area of Shanxi Province. [ABSTRACT FROM AUTHOR]

Dryland tomato is widely loved because of their high sugar content,low acidity,fine sand,and having high nutritional value and so on,but the traditional method of crop planting adopts continuous cropping,and it brings great loss to dryland tomato. According to the continuous cropping obstacle on dryland tomato,the causes of continuous cropping obstacles were explained from three aspects in this paper,including of the deterioration of soil function,the occurrence of fungal soil-borne diseases,and the influence of allelochemicals. The effects of soil physical and chemical properties,the enzyme activities,and the microbial population structure changes on the mechanism of continuous cropping were analyzed. We also discussed the pathogenic mechanism of soil-borne diseases and the main components and sources of allelochemicals,and proposed measures of overcoming dryland tomato obstacle. The research progress on continuous dryland tomato production obstacle is in prospect. [ABSTRACT FROM AUTHOR]