Chalky soils are always alkaline, which restricts the number of plants that can grow on them. Planting may also be difficult as spades frequently hit lumps of hard chalk or flint Clay soil - this ...

Clay soil is heavy and dense, making it notorious for being difficult for vegetable gardening. A garden area that is primarily clay will have trouble with water drainage and will not have enough air ...

IN the past few years, some workers 1–3 have described the presence in soils of a vermiculite-like clay mineral with a 14 A. basal reflexion, showing a behaviour intermediate between that of ...