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10 December 1994, Volume 15 Issue 06

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

娄秀荣，太华杰

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

王正富，廖荣俊，颜可贵

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

张有声，张嘉文，李明高，郭辉，农天文

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

李耀先，易燕明，李秀存，莫新

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

杜懋国，邱振英，张广柱

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

王一呜，杨建中

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

杨凯，杨岚，陈永厚

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

李国师，王海东，杨守邦，段辉

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

戚尚思，王侠，孙惠合

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

朱寿燕，沈青山，俞树标，陈宝福

1994, 15(06):  . 

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Mechanism of Insufficient Illumination on Rice Yield and its Control Technology ⅢThe Difference of the Response to Insufficient Illumination among Different Rice Cultivars

Li Lin；Zhang Gengsheng（Institute of Agricultural Modernization,Jiangsu Academy of Agricultural Sciences）

1994, 15(06):  . 

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The difference of the response to insufficient illumination among different rice varietal types isilluminated in this paper,with four representative cultivars Sanyo 63＃(i.×),Yayou2＃(i.×j．)Zhendao 1＃(medium j.)and Wjuyujing 2＃(late j.)After trcated with the disaster of the same degree in tillering phase,the two japonica cultivars with longer growth duration had smallerdecrease rates in panicle number and yield than the two hybrid ones.Within the japonica cultivarsthe losses of panicle number and yield of the late one were much lessthan those of the medium one.Theinfluence of low light in flowering-filling period on yields of different rice varieties changed as its effect on their full grain percentages did.The yield loss rates of Yayou 2＃and Sanyou 63,whose the full grain percentages were 28.9％and 26.5％lower than their own contrast ones,were 4～6％and 7～9％higher than those of the two japonica culttvars，respectlvely，Therefore，lnslIfflcientillumination no matter in tillering or flowering-filling period impairs j. rice cultivars in a smallerdegree than it harms i. ones,while among j. ones,impaired degree of late ones is smaller than medium ones.

A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

蔡焕杰，熊运章

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

高阳华，张成学，高阳兴，熊志强

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

胡芬，赵聚宝，姜雁北，梅旭荣，钟兆站

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

汪惠芳，毛健

1994, 15(06):  . 

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Mechanism of Insufficient Illumination on Rice Yield and its Control Technology ⅢThe Difference of the Response to Insufficient Illumination among Different Rice Cultivars

郑景云

1994, 15(06):  . 

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A method of Estimating Crop Leaf Area Index and Leaf Angle Distribution

Liu Anguo（Huazhong Agricultural University）

1994, 15(06):  . 

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Based on the theory of relation between crop canopy structure and gap fraction in canopy ,an indi-rect method for estimating crop leaf area index（LAI）and leaf angle distribution were developed in thispaper. Using the method, the gap fraction in canopy could be calculated by observing transimittance ofgloble solar radiation，and LAI and its distribution in different leaf angle intervals could be estimatedthrough a simple mathematical model．The method has been tested for two crops，maize and oilseedrape，and the result shows that the accuracy of the method is high enough for practical application。