172 PERIODICITY IN THE GROWTH OF SUGARCANE 



Chynia. grows well at the Coimbatore Central Farm and Sabour ; 

 moderately at Taliparamba and Samalkota : and poorly at Pusa 

 and the Cane-breeding Station. 



^aroukha grows well at Taliparamba and the Coimbatore Central Farm ; 

 moderately at Sabour ; and poorly at Samalkota and the Cane- 

 breeding Station. 



Mungo grows well at Shahjahanpnr and Aligarh ; moderately at Talipa- 

 ramba, Sabour and Pusa ; and poorly at the Cane-breeding 

 ' Station and Coimbatore Central Farm. 



From the above summary we see that the individuality of the cane makes 

 its mark throughout the series and, generally, there seems to be a tendency 

 for the growth of varieties to be better near the native habitat of the cane, 

 a result not without its significance. 



Similar tables might be prepared, comparing the growth of these varieties 

 and the development of their individual characters in the three regions, garden 

 land, wet land and Gangetic alluvium, and so on ; but it is considered that the' 

 three tables given will sufiiciently demonstrate the method. 



V. The effect of the season on the length of the joints. 



Two sets of unit observations have been made at Samalkota in the Goda- 

 vari District of the Madras Presidenc}^, one during 1915-16, on canes ten 

 months old, and the other during 1916-17, on canes 11 months old. On 

 examining the joint curves of Saretha obtained in these two years, it is seen 

 that they could not well be more different (Plate III). This fact caused a 

 good deal of trouble, as it appeared generally to discredit the method adopted 

 in this paper. In 1915-16 the first joints were short, they showed an irregular 

 series of maxima and did not attain their greatest length until the 21st from 

 the base, and this maximum was not great ; but there were a large number 

 of joints, so that the cane was long. In 1916-17 the first joints were long 

 and quickly attained their maximum (at the 4th joint), this maximum was 

 high, but the number of joints was small, so that, in spite of their length, the 

 whole cane formed was rather short, although the plants had been longer in 

 the ground than in the previous year. This 1916-17 curve was, however, 

 similar to those obtained at other places. The curve of 1915-16 was altogether 

 unique, and unlike that obtained at any other place. The general average 

 joint curve, of all the 89 unit observations, has been added in the Plate for 

 comparison. 



