Southern field crops (exclusive of forage plants) . arentlyabout as effective as 200 pounds. In one test 60 pounds of kainit effected a noticeabledecrease in the injury from this disease. Apparently itis safer to use at least 80 pounds per acre where the pur-pose is to combat rust. In the fertilizer experiments in Alabama two facts relativeto kainit and cotton-rust are noticeable, viz. (1) the usual favor-able effect of kainit in checking rust, and (2) Its occasional failureon some soils and in some seasons to reduce the injury resultingfrom this disease. Just how potash decreases rust is not
Southern field crops (exclusive of forage plants) . arentlyabout as effective as 200 pounds. In one test 60 pounds of kainit effected a noticeabledecrease in the injury from this disease. Apparently itis safer to use at least 80 pounds per acre where the pur-pose is to combat rust. In the fertilizer experiments in Alabama two facts relativeto kainit and cotton-rust are noticeable, viz. (1) the usual favor-able effect of kainit in checking rust, and (2) Its occasional failureon some soils and in some seasons to reduce the injury resultingfrom this disease. Just how potash decreases rust is not wellunderstood. It enables the cotton plant to remain green andthrifty through periods of unfavorable weather. Probably it 334 SOUTHERN FIELD CROPS reduces the amount of water necessary to keep the plant in health,Judging by the fact that potash has been found to reduce theamount of water transpired by the leaves of the corn in the fertilizer usually causes the later retension in theautumn of the leaves of the cotton plant (Fig. Fio. 14S. — A Cotton Field, showing the Effects of Pot-vsh inRetention op the the riKht, the fertilizer eontained no availalile iiotash ; ou theleft, it contained .50 pounds muriate of potash per acre. 308. Kainit, muriate and sulfate of potash. — In ex-periments in Alal)ama, a pound of potasli in the form ofmuriate was as effectiA-e in checlving rust as when an equalamount was apphod in the form of kainit. It is sHghtlyless convenient to apiily nniriate of potash ; for as this isfour times as strong as kainit, it is advisable to use only COTTON FERTILIZEBS o3a 25 to 50 pounds of the muriate per acre, which smallamount necessitates extreme care in pulverizing and evenlychstributing this fertilizer. Aside from this slight con-sideration of convenience, the farmer should buy that oneof these materials in wliich a pound of potash deliveredat his farm costs him less. Where the freight rate andcost of hauhng is high, the mur
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Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
