FIELD CROPS. 



547 



Various forms of potash were tried on 7 plats, on 2 of which the 

 experiment was carried on for only 4 years. The plats received each 

 year 105 lbs. of nitrogen per acre in the form of cotton-seed meal, 340 

 lbs. per acre of potash in different forms, and 150 lbs. of phosphoric 

 acid. In 2 cases lime was added at the rate of 300 lbs. per acre The 

 following table gives the results: 



Comparison of the effects of various forms of potash as tobacco fertilizers. 



Plat. 



Source of potash. 



Yield of leaf tobacco per acre. 



Lbs. 



Cotton-hull ashes 1. 615 



Double sulphate of potash and 



magnesia 1. 77G 



Double sulphate fit' potash and 



magnesia with linn- 



High-grade sulphate of potash 

 High-grade sulphate of potash 



with lime 



Carbonate of potash 



Double carbonate of potash 



and magnesia 



Wood ashes 



1.C64 

 1,709 



1,690 

 1,549 



1,416 

 1,482 



Long Short 

 wrap- wrap- 

 pers, pers. 



Lbs. 



Percent- 

 age of 



wrap- 

 pers. 



Lbs 



X umber of 

 pole-cured 



leav.s to 

 pound. 



Long 

 wrap- 

 pers. 



i\r, 



Short 

 wrap- 

 pers. 



Number of 



seconds 



holds Are. 



-'J 



Long Short 

 wrap- wrap- 

 pers, pers. 



The phosphoric acid applied to plats A and Y was chiefly in the ashes, 

 while the other plats were supplied with it in the form of Cooper bone. 



"The quality of the wrappers, .judged from the 4 crops already examined, by the 

 expert, was about the same as that of wrappers of plat A, where colton-hull ashes 

 were used. 



"The addition of lime had little effect on the quality of leaf. 



"The plats dressed with hitrh-grade sulphate of potash with and without lime, M 

 and X, bore a larger average crop than any except K, and rather more wrappers than 

 most of the others. But the leaves held tire for a shorter time than those from the 

 other plats, and. the quality of the 4 crops already examined was poorer than that 

 of any others in the series. 



"Plats O, P, Y, having as their source of potash carbonate of potash, double car- 

 bonate of potash and magnesia, and wood ashes, respectively, hore lighter crops than 

 the others in their series, but the average quality, judged from the 4 crops from O 

 and the 3 crops from P and Y, already examined, was the best in the whole experi- 

 ment field.'' 



A test of small quantities of potash in the fertilizer was made dur- 

 ing 4 years on 2 plats designated B and F, which in 1892 had received 

 340 lbs. per acre in cotton-hull ashes and plat B had received 140 lbs. 

 of nitrogen in cotton-seed meal, while plat F received an equal amount 

 in the form of castor pomace. 



During the experiment both plats received like quantities of nitro- 

 gen and phosphoric acid, but plat F received 150 lbs. of potash per 



