Abstract:In five types of soil with a vertical band spectrum on the north slope of the Shennongjia Mountain area, 2:1 type clay mineral is predominant, and there is a little kaolinite. The ratio of SiO_2/Al_2O_3 in clay fracions is about 3.0-3.4. There is a weak d

Abstract:The natural conditions on the soil formation in Xingdoushan natural reserve were presented briefly. According to the soil classification system of "Exisoil" and "Lichuan country soil collected works", the shape and characteristics of mountain yellow earth

Abstract:The fertility changes of 4 PGMR--lines, Nongken 58S, 6334S, W7415S, and W6154S, in response to the combinations of different photoperiods and temperatures were studied in phytotron. The results showed that, the fertility changes of Nongken 58S and other 3

Abstract:Photoperiod-sensitive genic sterile lines Nongken 58s and Fang 8-2s, which are sensitive to photoperiod in the first photoperiodic reaction of developmental inducement, were crossed with 5 general varieties which are insensitive to photoperiod in both of

Abstract:This is a review on apomictic rice research. Except in China, apomictic rice material has not been found in the world. Study of apomictic rice has been conducted through three stages in China. induction of apomixis in vivo, induction in vitro, screen and

Abstract:The embryological studies on four strains of poly pbryonic rice (Oryza sativa) and some results were discussed this paper. These were carried out mainly to observe the types and the frequencies of polyembryony, and to screen out proper strains which will

Abstract:Cells in calli differentiated into meristamic cell, parenchyma, collenchyma and tracheary element on adapting to their function. Callus was simpler in organization and function than whole plant. Meristamic center could proliferate and divide into several

Abstract:Somatic embryos of 1-3mm long were observed two weeks after subculture of suspensions of cotton cultivar Coker-201 (Gossypium hirsutum L.) on maturization medium. Some embryos began to germinate 20 days later. The germination reached the climax in 51-55 d

Abstract:This research deals with hair characters of 11 upland cotton strains which possess different aphid resistance, and with the relationship between them. Genetic effects of multiple hair density on main veins of leaves are also studied by analyzing 6 populat

Abstract:The studies on application and physiological effects of brassinolide in 9 species of crops, that have been done by the authors since 1984, have been introduced comprehensively in this article. The main results are shown as follows : BR as one yield stimul

Abstract:A declined strain R-ld of Rhizoctonia solani was obtained from the healthy one R-1(AG-4), which was isolated from the diseased cotton seedling, by routine transfer. The cultural characteristics of R-ld are a slow growth rate, thin hypha and sparce substra

Abstract:After the investigation of epidemiology and environmental factors, 97 buffaloes were selected for experiment, 44 of them fed in the industral pollution of fluoride area were conducted as test group, and 53 of them fed in low fluoride and no-pollution of f

Abstract:Among six pig farms had an outbreak of severe diarrhea. Samples of mesenteric lymph gland and tonsil from those moribund and died piglet were examined by immuno-fluo-rescent technique (IFAT) for detection of transmissible gastro- enteritic (TGE) viral ant

Abstract:Among the microcrustaceans collected from 33 counties of Shandong Province, during Nov. 1989 to Nov. 1990, 12 species of Cladocera, 12 species of Copepoda and 4 species of Ostracoda newly recorded from this province have been obtained. Among these, 1 spec