The effect of phosphate fertilizers on the potato crop in south‐east scotland

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Abstract
In sixteen field experiments carried out on the potato crop in south‐east Scotland using different rates of superphosphate, little or no response in total yield was recorded except on four soils containing very little ‘available’ phosphate. Several of the experimental crops were riddled and the yields of ware, seed and chats recorded. On soils containing easily soluble phosphate at a level higher than 12 mg. per 100 g. of soil, the yields of ware and seed potatoes were not appreciably raised by increased levels of applied phosphate. In the low‐phosphorus soils the maximum yields of ware and seed were reached at dressings of 5 and 10 cwt. of superphosphate respectively. The optimum rate of superphosphate was approximately 5.0 cwt. per acre for the low‐phosphate soils, and 1.5 cwt. for the soils with higher available phosphate.

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