Key;
Laboratory;
of;
Soil;
Erosion;
and;
Dryland;
Farming;
on;
Loess;
Plateau;
Northwest;
Agriculture;
and;
Forestry;
University;
Yangling;
712100;
P.R.;
China;
of;
Forestry;
Northwest;
Agriculture;
and;
Forestry;
University;
}Tangling;
712100;
P.R.China;
水分利用效率; 半干旱地区; 旱作冬小麦; 粮食产量; 根系生长; 施磷; 条件影响; 土层;