Table of Content

10 June 1991, Volume 12 Issue 02

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ON THE LOW TEMPERATURE BOUNDARY OF WHEAT

Zhang Songwu (Northwestern Agricultural University)

1991, 12(02):  40549-405. 

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The early senescence of dwarf wheat is a prominent problem in dwarf wheat breeding and production at present.The results obtained from study for years showed that relationships are very close between the higher te- mperature level of the second heat source of dwarf wheat population and its early senescence. Discovery with the time limit of dwarf wheat with temperature which is lower than that of tall wheat provides ecological basis worth meditation for overcoming the early senescence of dwarf wheat.

THE GREY CONTROL OF THE GROUND-WATER TABLE AND IRRIGATION DECISION OF SALINIZED SOIL

Wang Pengwen (Jilin Academy of Agricultural Sciences) Wei Shuqu (Beijing Agricultural University)

1991, 12(02):  40734-407. 

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This paper uses the grey control systems theory to put forward a grey control model of the ground-water in Huang Huai Hai Plain.Starts on two goals:prevent secondary salinized-soil,reasonable irrigation,to make the best irrigation decision.

STUDIES ON THE INFLUENCE OF MICROMETEOROLOCIGAL CONDITIONS ON GROWTH DEVELOPMENT AND YIELD OF SOYBEAN AND ITS ADJUSTMENT MEASURES

Pan Wanqing Jiao Jiang Mao Chengwei Shang Zhimin Wang Lianmin (Crop Tillage And Cultivation Research Institute Heilongjiang Academy of Agricultural Sciences)

1991, 12(02):  40862-408. 

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The population that formed a flourishing shoots in the early stage and not shaded severely in the later stage is a high yield character and struct- ure which is in favor of gas exchange and transmission of sunlight.As co- ncerns most years,water is a dorminant meteorological factor which lim- its soybean production in Heilongjiang Province.The narrow line span is in favor of water reservation.Among soybean species cultivated in Heil- ongjiang,the micrometeorological environment between plants where maximum LIA is around 6 and dencity is about 0.35-0.45 million plants ha is appropriate and the yield is higher.Lodging have great effect on yield and quality.The rowcropping-can relatively reduce the lodging degree,and it also can relatively increase soil temperature by comparison with sowing on level row.