THE MANURING OF THE CANE. 



a, 30 kilos nitrogen as dried blood, b as sulphate of ammonia, c as nitrate of soda, 

 d, 10 ,, ,, ,, ,, e ,, ,, f ,, ,, 



g, 13*3 ,, ,, ,, ,, h ,, ,, i ,, ,, 



j> 6*6 ,, ,, ,, >, k ,, ,, ,, ,, 



m 20, n 6, o 13-3, p 40 kilos soluble phosphates ; q 20, r 26'6, s 13*3 kilos in 

 soluble phosphate ; t 40 kilos citrate soluble phosphates ; u 30, v 40, w 20 kilos 

 potash ; x 20 kilos nitrogen as nitrate of soda. 



Hawaii. The result of a series of experiments led C. F. Eckart 6 to 

 the following conclusions : 



1. Lands, capable of producing eleven tons of sugar to the acre without 

 fertilization, may be fertilized with profit, climatic conditions and water supply 

 being favourable. 



2. While soils of high fertility may respond to mixed fertilizers, the 

 percentage of gain is greater as the soils suffer a gradual exhaustion. 



3. The Rose Bamboo and Lahaina varieties of cane did not show the same 

 response to various combinations of fertilizer ingredients. 



4. It is indicated that Rose Bamboo requires a larger store of phosphoric 

 acid to draw from than Lahaina for the best results. 



5. Lahaina cane responded more to an increased supply of potash in the 

 soil than Rose Bamboo. 



6. Both Rose Bamboo and Lahaina cane showed a considerable gain in 

 yields from fertilization with nitrogen. The percentage of this element in the 

 soil on which the tests were carried out was below the average for the islands. 



7. On a soil containing phosphoric acid (soluble in a 1 per cent, solution of 

 aspartic acid) in quantities which were in large excess of those contained in 

 the average soil, phosphoric acid applied with nitrogen gave yields of Rose 

 Bamboo cane exceeding those obtained when nitrogen was applied alone. 

 Under the same conditions, Lahaina cane gave about the same yields following 

 fertilization with nitrogen as when nitrogen was applied with phosphoric acid. 



8. On a soil containing potash (soluble in a 1 per cent, solution of aspartic 

 acid) in quantities comparing closely with those of the average island soil, Rose 

 Bamboo and Lahaina cane gave increased yields when this element was applied 

 with nitrogen. 



9. The separate application of phosphoric acid in soluble forms to lands 

 standing high in phosphoric acid may result in a loss of sugar rather than in a 

 gain. It is indicated that the chances of loss are greater with Lahaina cane 

 than with the Rose Bamboo variety in localities where the two varieties make 

 an equally thrifty growth under normal conditions. 



10. Separate applications of potash in the form of sulphate of potash may 

 decrease the yields of cane. The danger of loss is apparently greater with 

 Lahaina cane than with Rose Bamboo. This refers to applications of potassium 

 sulphate to lands under cane. 



61 



