麦栽培における畦の形状について (予報)

抄録

The aims of this study are the improvement of microclimatic conditions in the wheat or barley field.
In this paper, the ridges of E-W direction are compared to the ridges of N-S direction, and the insolation quantity on the sloped faces (angle of inclination i=15°) of the ridges is calculated as to the four directions. (Used factors: Solar constant I₀=1. cal. cm^-2. min^-1., Latitude φ=33°12′ N at HAINUZUKA)
The difference of the insolation quantity on the soil surface of the E-W ridge from that on the N-S ridges is small in the early growing term, and the difference becomes large in the late growing term. (See Fig. 2, A)
The insolation quantity on the wheat plants of E-W ridge is larger than that on N-S ridge in the early growing term, but the states become reverse since the second decade of March. (See Fig. 2, B)
The growth and yields of wheat plant are showed in Table 1 and 2, and the ears in the N-S ridge were 20% heavier than those of E-W ridge. In winter, the insolation quantity on the South slope is the most, on the East or West slope is the second and the same as that on horizontal surface, and on the North slope is very small: but there are little differences among four sloped faces in summer. (See Fig. 3)