Progress of improvement and utilization of saline-alkali land
liu yangchun1; he wenshou1; he jinzhi2; shen zhenrong3(1.school of agriculture; ningxia university; yinchuan 750021; china; 2.government of xinying township; xiji country; ningxia province; xiji 756201; china; 3.bureau of farm and land reclamation of ningxia; yinchuan 750021; china)
..............page:68-71
A study on the top-grafting effect of red bartlett,Pyrus communis L.
zhang guangdi1; yang zhengde2; yu xiaoyan3; zhang junxiang1; wang lifeng1 (1.school of agriculture; ningxia university; yinchuan 750021; china; 2.forestry bureau of pengyang county; pengyang 756500; china; 3.administrative department of aiyi-river garden; yinchuan 750001; china)
..............page:39-42
..............page:20-22,26
..............page:89-90,93
..............page:76-78,86