16 SOME ASPECTS OF THE INDIGO INDUSTRY IN BIHAR 
phosphate (0001 per cent). The results obtained may be summed up as 
follows :— 
(a) In both Pusa and Kalianpur soil, the indigo in the lysimeters with 
free drainage escaped wilt. 
(b) When the drainage openings were closed and waterlogging from 
below took place, all the plants were wilted in both Kalianpur 
and in Pusa soil. 
(c) The wilt in Kalianpur soil (rich in available phosphate) was 
much worse than in Pusa soil (said to be low in available 
phosphate). 
(d) The growth in Kalianpur soil was much slower than in Pusa 
soil. 
Recovery from wilt. Cases of complete recovery from wilt occur fre- 
quently. Good examples occurred during the rains of 1919. As previously 
mentioned, wilt first made its appearance this year between July 23rd and 
August 7th, and again during the first three weeks of September. After the 
first attack, which was slight, it was observed that plants frequently recovered 
and after showing wilted foliage produced normal shoots. The roots of two 
plants which recovered from wilt were exposed on August 21st, and were 
found to have produced numerous new healthy roots. This regeneration was 
evidently due to improved soil conditions. In one of the two cases examined, 
a branch, which showed wilted foliage, continued to grow in length and to 
form healthy leaves. This does not often occur im cases of recovery. Asa 
rule, the wilted branches die and new healthy shoots are produced, 
A second interesting case of recovery from wilt on the large scale occurred 
in March, 1919, in the case of two plots, which were badly affected at the end 
of the previous monsoon. Both plots, however, showed a remarkable recovery 
in March and April 1919. The diseased plants commenced to grow and the 
shoots and roots formed were perfectly healthy. Similar results were obtained 
in a plot of Type 15, which had yielded two heavy crops of leaf during 
1918. Many of the plants were attacked by wilt during the cold weather 
of 1918-19, but there was a remarkable recovery in March and April 
of 1919. The new growth was abundant and healthy and so vigorous 
were some of the individuals that they survived the monsoon of 1919, 
and at the present time, October 1919, promise to give a second. seed 
crop. 
The most striking cases of recovery from severe attacks of wilt occurred 
in the lysimeter experiments of 1918. In two cases, in lysimeters which had 
been waterlogged from below during the rains and in which all the plants were 
