7BENNIE A T P, BOTHA F J P. Effect of deep tillage and controlled traffic on root growth,water-use efficiency and yield of irrigated maize and wheat[J]. Soil&Tillage Research, 1986,7(1-2): 85 - 95.
8ROSS C W. The effect of subsoiling and irrigation on potato production[J]. Soil&Tillage Research, 1986, 7(4): 315 - 325.
9IDE G, HOFMAN G, OSSEMERCT C, et al. Root-growth response of winter barley to subsoiling[J]. Soil&Til|age Research, 1984, 4(5): 419 - 431.
10ROWSE H R, STONE D A. Deep cultivation of a sandy clay loam 1. Effects on growth, yield and nutrient content of potatoes,broad beans, summer cabbage and red beet in 1977 [J]. Soil& Tillage Research, 1980-1981, (1): 57 - 68.