[1 Szpr., 1899. 
298 QUEENSLAND AGRICULTURAL JOURNAL. 
The fertiliser applications and yields, calculated per acre, are given in the 
following table :— 
N | Yields (fibre | Increase over 
ate ot Fertilisers Applied per Acre, in lb. and seed) per! Unfertilised 
| Acre. Plot. 
lb. lb. 
1 No fertiliser ... 760 
1a | 2,000 Ib. lime ~ ns Py ne Ay ie an 780 20 
2 615 ,, acid phosphate and 200 lb. nitrate of soda ... ee 2,115 1,355 
Qa 615 ,, acid phosphate, 2001b. nitrate of soda, and 2,000 lb. 
lime 7” iP Sh ay a ne ce 1,930 1,170 
3 615 ,, acid phosphate, 2001Ib. nitrate of soda, and 120 Ib. ' 
muriate of potas i: aot Ate re re 2,640 1,880 
8a 615 ,, acid phosphate, 200 Ib. nitrate of soda, 120 lb. 
muriate of potash, and 2,000 Ib. lime ers 2,550 1,790 
4 615 ,, acid phosphate, 200 Ib. nitrate of soda, and 240 lb. 
muriate of potash n, — ae oe oer 2,345 1,585 
4a, 615 ,, acid phosphate, 200 Ib. nitrate of soda, 240 lb. 
muriate of potash, and 2,000 Ib. lime De 2,170 1,410 
The following report was made in connection with this experiment :—Better 
results would have been obtained, if the weather at the beginning of the season 
had not been exceptionally unfavourable. It is evident from the result of the 
experiment that RedePaGn acid is the regulating ingredient, though the 
addition of potash to the phosphoric acid and nitrogen made a still larger 
increase (about 10°50 dollars per acre), which more than paid for the cost of 
the fertiliser. 
Lime was of no value to the cotton, as it was applied in the spring, and 
other observations have shown that lime is of little service to crops of cotton 
when applied later than December of the previous year. The soil upon which 
the experiment was conducted does better with cotton-seed meal as a source of 
nitrogen than with nitrate of soda. : 
Experiments conducted in the cotton section of the United States have shown 
that the application of kainit to cotton prevents the development of a disease of 
this plant, called yellow leaf blight. 
Dr. Atkinson remarks in his report:— Yellow leaf blight or cotton is, 
some years, very destructive. It is likely due to both improper nutrition and 
unfavourable physicial condition of the soil. The experiments show that, by 
the use of kainit, leaf-blight is largely, if not entirely prevented, and the yield 
of cotton increased. ‘This is corroborated by many farmers.” 
Tn all of these plots, it was easy to see, by comparison with the others, 
that the entire ‘or partial prevention of the disease was due to the kainit. 
The yield of the kainit plots is from 70 per cent. to 100 per cent. above 
those where no fertiliser was used, and an average of 40 per cent. over that of 
any other fertiliser or combination, used without the kainit. 
A report upon similar experiments, conducted at Hope Hull on black, 
loamy soil, was made by Mr. A. H. Clark:— 
“There can be no doubt as to the effect of kainit, as my former experience 
is the same as that of this year, but I think it would require not less than 500 
or 600 lb. of kainit per acre to thoroughly prevent the disease.” 
These results have been confirmed by other experiment stations and by 
farmers, for instance, by Dr. H. B. Battle, of the North Carolina Station, as. 
early as 1888. 
