MANURING EXPERIMENTS WITH PADDY RICE. 
7 
it had been raised. This practice, which deserves to be as 
widely extended as possible throughout the rice growing dis¬ 
tricts, obviously aims at an accumulation of nitrogen in the 
soil and thus at a reduction of nitrogenous manures. It is a 
recently well established fact that leguminous plants have the 
peculiar faculty of assimilating the free nitrogen from the air, 
which process is not accomplished in other kinds of plants. 
Thus, by the cultivation of genge and other leguminous crops 
and by using them as manure on the same land, the farmer 
increases the stock of nitrogen in the soil. We sowed these 
plants on 12 plots on April 4th after applying 3 days previously 
phosphoric acid and potash, and to 9 plots among the 12 also 
lime. When however the time came for planting the rice, 
the genge was still very small and could not yet have accu¬ 
mulated much nitrogen, wherefore these trials will be repeated 
in the coming season (1890). The quantities of nutrients 
applied per tan ( = 1 / 10 hectare) were the following: 
I. Series. Unmanured, and Partial Manures. 
Plot 8, 32 and 61 
,, 9, 33 and 62 
,, 10, 34 and 63 
» il» 35 and 6 4 
» 12, 36 and 65 
Unmanured. 
25 kilogrms. phosphoric acid and 20 kilo- 
grms. potash. 
25 kilogrms. phosphoric acid and 15 kilo¬ 
grms. nitrogen. 
20 kilogrms. potash and 15 kilogrms. 
nitrogen. 
Unmanured. 
II. Series. Nitrogen. 
General Manure for each plot: 25 kilogrms. phosphoric 
acid and 20 kilogrms. potash. 
Plot I, 13, and 20 
5 kilogrms. nitrogen 
,, 2, 14 and 21 
7-5 
,, 3 » r 5 and 22 
10 »» »» 
,, 4, 16 and 23 
12.5 „ 
„ 5, 17 and 24 
15 » >» 
,, 6, 18 and 25 
17-5 .. 
