E. J. BUTLER 33 



Around Nagori village, where the disease is extremely severe, 25 acres 

 were brought under treatment in 1917. The treatment was simple stubble 

 burning, with perhaps somewhat more thorough ploughing subsequently than 

 is customary. Deep-water aman and digha paddy were. sown. A good harvest 

 was obtained, only 3 acres being attacked by ufra. 



In 1916 field trials of the efEect of burning the stubble in infected land 

 were carried out under the orders of the Collectors of Tippera and Dacca. 



In Tippera trials were made in the Chandpur and Sadar Subdivisiojis. 

 In the former 64 plots of land were treated, comprising in all about 4:6| acres. 

 The stubble was burned after harvest and the land ploughed 10 times before 

 sowing. There was no expert supervision of the operations, and no further 

 details of the treatment were given. Nine of the plots were slightly affected 

 by ufra, the rest escaped. In the Sadar Subdivision 12 plots, comprising 

 nearly 11 acres, were treated. They included high, low, and intarmediate 

 levels. Some had been damaged by ufra for 5 or 6 years continuously, some 

 for 2 or 3 years, some in alternate years. The stubble was burned after 

 harvest and the land ploughed and harrowed 15 to 18 times before sowing. 

 No ufra appeared in any of the plots, though one had an affected plot adjoining 

 it. Still ufra was little prevalent in the district around in 1916, having only 

 been reported to have damaged 30 acres in 12 square miles. There had been a 

 flood of exceptional intensity in the monsoon of 1915, and a great deal of deep- 

 water paddy was lost. This seems to have had a remarkable effect in reducing 

 ufra the following year. It is probable that there was little contaminated 

 stubble left to carry over the disease to the following crop. 



In 1917, 11 acres near Laksam were treated as in the previous year. No 

 ufra appeared, though in one case there was an attack close by. The disease 

 remained relatively mild in the surrounding tracts. 



In Dacca experiments were carried out in two widely separated areas in 

 hils running into the high old-alluvium of the Madhupur Jungle. One of these, 

 the crop in which had been severely attacked by ufra in 1915, was " bmided " 

 across at the point where it debouched on the plain. The stubble was burned 

 a considerable time after harvest, and as late as March 1st, 1916, the ploughing 

 was still incomplete and the bund unfinished. As a result, the seed was broad- 

 casted between six weeks and two months later than customary and the 

 water rose before the plants were high enough to withstand injury. No ufra 

 appeared, but the harvest was poor owing to the defective treatment the crop 

 had received. Unfortunately here again there was little ufra in the immediate 

 neighbourhood, the nearest diseased patch found being about \ mile away. 



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