14 MANURING EXPERIMENTS WITH PADDY RICE. 
for the rice crop, especially by the 2nd and 3rd series. The 
only exception to the rule appeared in the case of the small 
crop on the plots which had received copious nitrogenous and 
potassic fertilizers without phosphatic nutrients ; owing to this 
abnormal mixture of nutrients the transportation of organic 
substance from the leaves into the grain was obviously serious¬ 
ly disturbed. The latter opinion is confirmed by the fact that 
on those plots the yield of grain (89.7 grms.) was smaller than 
on the unmanured ones (106.4 grms.), in spite of the large 
supply of nitrogen and potash. 
As the size of the grains is only so slightly affected by the 
manures, it cannot be expected that the proportion of hulled 
grain and chaff obtained from the full grain should show great 
variations in the different trials. Indeed, the percentage of 
chaff is nearly constant throughout all the trials ; it varies only 
between 17 and 18.5. 
The quantity of empty grain in the various trials shows a 
distinct relation to the number of panicles gained by tillering. 
The new shoots sent up from the roots, develop their panicles, 
of course, later than the original stems, and were just flowering 
when the hurricane occurred. The injuries done by the latter 
were accordingly the greater, the more shoots had been pro¬ 
duced. Besides this, the cold rainy weather throughout the 
month of September was also unfavourable to the fertilization 
of the late flowering panicles. 
The effect of the various quantities of manures on th e yield 
of the rice crop will be best shown by the following tables which 
contain the amounts of straw and hulled grain per tan^— 1 / 10 
hektare) in metric and Japanese measures. 6 ). The figures 
given under “corrected yield” are calculated from the quantity 
of undeveloped grain and the weight of 1000 individual empty 
grains ; they indicate the highest yield obtainable under the 
most favourable conditions of weather and treatment of crops, 
6) i kuwamme = 3.75652 kilogrms. ; x koku = 180.39 litres. According to 
numerous weighings of the Tokyo Chamber of Commerce 1 koku of hulled 
rice weighs 37.514 kuwamme = 142.3 kilogrms. 
