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Effects of fertilisers on the yield of potatoes in S.E. Scotland
Author(s) -
Simpson K.,
Crooks P.
Publication year - 1961
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740120207
Subject(s) - yield (engineering) , potassium , acre , potash , agronomy , phosphorus , chemistry , farmyard manure , ammonium , field experiment , ammonium chloride , chloride , fertilizer , biology , materials science , organic chemistry , metallurgy
A series of field experiments was made on maincrop potatoes grown for seed with farmyard manure. The optimum rates of application of ammonium sulphate, superphosphate and potassium chloride were considerably lower than those at present practised in the area. Use of 120 lb. of N per acre, consistently depressed yield of both ware and seed. Moderate applications of superphosphate (60 lb. of P 2 O 5 per acre) increased seed yield generally but had little effect with soils high in easily soluble phosphorus. Potassium chloride increased the ware/seed ratio considerably. Interactions between the effects of the fertilisers on yield were very small.