关键词: 造纸污泥, 造纸污泥, 蚯蚓, 养分, 杨树

Abstract: The purpose of this study was to analysis the effects of shading on agronomic characters, yield traits and yield of major maize cultivars in huang-huai-hai region, using the top ten maize cultivars of huang-huai-hai region which were planted in four provinces (cities), as materials, arranging two treatments that shading 7 days before tasseling stage and no shading in whole growth period. The results showed the agronomic characters, yield traits and yield of major maize cultivars in huang-huai-hai region were affected significantly by shading treatment; the yield of ten cultivars was decreased significantly, the anthesis silking interval(ASI) of six cultivars was extended and the silking percentage of nine cultivars was reduced; the yield decrease of major maize cultivars was significantly relevant to the reduction of kernels per row, ear length, ear diameter and 100 grain weigh and the increase of bare tip length; ‘Weike702’ had exhibited the best performance of shade-tolerance among ten maize cultivars (the average yield of four places ranked first, the silking percentage and yield reduced at least) and followed by ‘Zhengdan958’, ‘Liyu16’, ‘Longping206’. Therefore, ‘Weike702’ and other shade-tolerant cultivars should be adopted in maize production, meanwhile, the kernels per row, ear length, ear diameter, 100 grain weigh, bare tip length, silking percentage and anthesis silking interval, which were significantly relevant with shading treatment, could be used as the identification parameters in maize breeding of shade-tolerance.