Abstract
The author has made the experiments on the cultivation of winter and spring wheat varieties, and oecological studies at Nobeyama highland in Nagano Prefecture. Winter wheats are able to cultivate economicaly, if the wheat varieties-those are as like as the Norin-39 in winterhardiness-are sown in well time, from Septmber15 to September 25, and are fertilized phosphorous manure sufficiently, and are made defence against orange rust and black-stem rust. Among the factors affecting the yields, the weight per 1000 grains is most effective, and it is inferior in highland than in lowland on account of the incomplete growth of grains caused by orange rust and black-stem rust. Spring wheat is also able to cultivate, if it is sown earlier spring and is made defence against orange rust and black-stem rust. But the yields of spring wheat are smaller than those of winter wheat. The growth of seedlings of winter wheat variaties during autumn, winter hardy varieties goes more slowly than that of nonhardy ones, and become suitable condition at winter, namely the Top and Root ratio are small. Fertilization of phosphorous manure make well growth rates of roots and make small the Top and Root ratio.
