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# 农事学实践教程讲义 (三) - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 农事学实践教程讲义 (三)' - yoshio-austin

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### 二、测定方法

(一)作物叶面积的测定

1、剪纸称重法测叶面积矫正值：

100×待测叶叶形纸重量(y2，g)

100cm2纸重(y3，g)

10株总叶面积(cm2)＝10株总鲜重(y4，g)

×叶面积鲜重校正值(K1，cm2/g)

3、叶面积校正系数(K2)法测叶面积

K2＝叶片的实际面积/相应的长方形面积

＝叶形纸重/相应长方形纸重

### （三）实践操作

1、调查单位面积土地上作物的实际株数

### 3、计算叶面积指数

1hm2内的叶片总面积(m2)

10000(m2)

1hm2内实有株数×单株叶面积(m2)

10000 m2

1、用叶形纸称重法求校正系数K（填入下列表中）。

2、用叶片称重法求叶面积和叶面积指数（填入下列表中）。

3、测定叶面积有何实践意义? 在实践操作中应注意什么问题?