28 



(3) Nitrate of soda i> a better source of nitrogen than cotton-seed 

 meal Or COtton Seed, Compare plat No. ll with Nos. 11, is. i?o. and iM. 



(4) Cotton seed is not :i profitable fertili/er for sugar cane. Com- 

 pare plats Nos. -jo and i_M with No>. :',. 7. 1<>. and *2'.\. Cotton seed meal 

 gives Si 1 p,. r acre more profit than the same value in cotton seed. 

 Compare plat No. IS with plat No. 20. (In all estimates of profits 

 cane is valued at s I per ton.) Nit rate of soda shows S| _> per ton more 

 profit than the ^ame value in cotton-seed meal. Compare plat No. 19 

 with No. is. 



(5) Two application* of the fertili/er give the he>t IV>U!N. 



(6) Doubling potash shows no gain in tonnage over that given by 

 the normal fertili/er. and the general trend of the experiments indi- 

 cates about 50 pounds of actual potash per acre as homo- the mo-t 

 profitable amount for this soil. 



(7) Doubling nitrogen shows a gain of ;j to &\ tons ]>er acre over the 

 tonnage given by the normal fertilizer and about SD p. r acre more 

 profit, [n general, the experiment indicates 65 pounds of nitrogen pel- 

 acre as the most profitable proportion for this soil, the source of the 

 nitrogen to be mainly nitrate of soda. 



(8) Doubling phosphoric acid gives no gain over the tonnage given 

 by the normal fertilizer, but for some unknown reason shows a 

 decrease of 1 tons per acre and a gain of only 3 tons per acre over 

 the u no phosphoric acid" plat, No. 14. In general the experiment- 

 point to 100 pounds per acre of phosphoric acid as a sufficient amount 

 for this land. 



(i>) All the results indicate that the following formula will ir'ive the 

 fertilizer most suitable for a land like Field A: 



Pounds. 



12.5 JUT rent arid phosphate 800 (100 pounds phosphoric add = 7.7 per rent ). 



Cotton-seed meal. . . 1001,^ 



Nitrate , ,f soda 300/ ( P m mtn W '" " ^ l * ] - 



Muriate of potash 100 (50 pounds actual pot a> 1 1 3.8 per cent). 



FIELD B. 



(1) No special effect on the stand was noted a^ a result of the differ- 

 ent fertilizers, except that plat. No. 6 had a very poor stand at fii-t: 

 but this was overcome later by heavy suckering, which was probably 

 the result of a large application of nitrogen to this plat. 



(2) No difference was noted due to the source of the nitrogen, 

 nitrate of soda and cotton-seed meal showing the same tonnage. 



(3) Cotton seed is not as good as the same value in cotton-seed meal. 

 Compare plats Nos. 18 and 20. 



(tt) Two applications give the best results. 



(5) Doubling the potash gave no gain over the normal potash ration, 

 and the general trend of the experiments points to ~>n pounds per acre 

 of actual potash as being sufficient on a soil of this kind. 



