Recent studies on potato manuring in Ireland |
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Authors: | P F Ryan |
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Institution: | (1) Johnstown Castle Agricultural College, The Agricultural Institute, Wexford, Eire |
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Abstract: | Summary Lime has not been found of importance for potatoes except on cutaway hochmoor. Nutrient requirements per acre are about 70
lbs nitrogen. 40 lbs phosphorus and 170 lbs potassium. Farmyard manure was found to be a poor source of nitrogen but a good
source of phosphorus and potassiu. Different nitrogenous fertilizers in general gave similar results, but calcium cyanamide
gave inferior results.
Phosphatic fertilizers, except rock phosphate. generally compared well with superphosphate. Sulphate gave total yieds as high
as, and starch yields higher than, muriate of potash.
Growing potatoes for several years under nutrient deficiency did not affect “seed” vigour. Potassium deficiency could not
be corrected by spraying but top dressing gave good results. Soil analysis gave good correlation of nutrient level with crop
response to applied fertilizer. P and K deficiency had serious adverse effects on tuber size, K being worse in this respect
than P deficiency.
Paper read to the “Agronomy” Section at the 1st Triennial Conference of the E.A.P.R. Brunswick-V?lkenrode, 12–17 September
1960. |
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