Manurial Requirements of the Portsmouth Sandy Loam of the Darlington Area South

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Manurial Requirements of the Portsmouth Sandy Loam of the Darlington Area South
Frank D Frank Duane Gardner
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Untreated 100 Cowpeas 5 tons + lime 2 000 pounds SB8 Sodium nitrate, 200 pounds, + potassium sulphate, 200 pounds, + acid phosphate, 200 pounds and lime 1, 000 pounds J07 Sodium nitrate, 200 pounds, + potassium sulphate, 200 pounds, + acid phosphate, 200 pounds + lime. 2 000 pounds - --- -. _.
205 Cowpeas, 5 tons ... - 204 Cowpeas 2j tons + lime, 1 000 pounds 199 Cowpeas 2i tons Ifi7 Manure 10 tons + lime 2 000 pounds 156 Lime, 1, 000 pounds - _. - . - .. - 147 Manure 10 tons 144 Lime 2 000 pou
...nds 140 Sodium nitrate, 200 pounds, + potassium sulphate, 200 pounds, + acid phosphate, 200 pounds 130 Sodium nitrate, 200 pounds _. -- 117 Acid phosphate, 200 pounds . . .
113 Potassium sulphate, 200 pounds - . - ...
106 The above table shows that this soil, although thoroughly cultivated, well supplied with commercial fertilizers, and subject to a systematic rotation of crops, in which cowpeas are frequently grown, has responded in a marked degree to many of the manurial treatments.
Cowpeas have produced decidedly the largest increase in growth, applications of 2 tons and 5 tons giving increases of 57 and 104 per cent, respectively, and by supplementing this treatment with small amounts of lime, the gain has been increased to 99 and 138 per cent.


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