In an apple orchard sheltered by forest belts of Paulownia,sample points were set with isodistance in four directions according to the method of Systematic Sampling. In each sample point, measurement and analysis were made with the light intensity,sunligh
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周志翔 胡婉仪. A STUDY ON THE CORRELATION BETWEEN THE SHADES OF PAULOWNIA FOREST BELTS AND THE MODEL OF PAULOWNIA-APPLE-CROP INTERCROPPING[J]. Jorunal of Huazhong Agricultural University,1994,13(4).