1. The growth and activity of winter wheat roots in the field: root growth of high-yielding crops in relation to shoot growth;Barraclough;J. Agric. Sci.,1984
2. The effect of compaction of the arable layer in sandy soils on the growth of maize for silage. 1. Critical matric water potentials in relation to soil aeration and mechanical impedance;Boone;Neth. J. Agric. Sci.,1986
3. Alleviating mechanical impedance;Bowen,1981
4. Roots, plant production and nutrient use efficiency;De Willigen,1987
5. Penetromer soil strength and root growth in tilled and untilled loess soil;Ehlers,1982