Life Sciences Commons^™

Bulletin No. 168 - Relative Resistance Of Various Crops Ot Alkali, F. S. Harris, D. W. Pittman

UAES Bulletins

Plants show considerable variation in their resistance to soil alkali. Some varieties of native vegetation grow only where the salt content of the soil is high. Most of the cultivated plants, on the other hand, are injured very decidedly by the presence of large quantities of soluble salts. To this rule there are a few exceptions such as the date palm.

In most of the arid parts of the world there are sections where the presence of alkali is the chief limiting factor in crop growth. Millions of acres of land are in the border zone between complete freedom from …

Bulletin No. 164 - Factors Affecting The Depth Of Sowing Various Crops, F. S. Harris, H. J. Maughan

UAES Bulletins

Probably no agricultural practice varies more than the depth to which seeds are sown. Some farmers pay very little attention to depth, but simply allow the seed to be placed where the drill happens to penetrate. The percentage germination of the seed as well as the vigor of the young plants is without doubt influenced by the depth of sowing, and certainly these factors are very important in determining the yield of crops.

Bulletin No. 120 - The Chemical Composition Of Crops As Affected By Different Quantities Of Irrigation Water, John A. Widtsoe, Robert Stewart

UAES Bulletins

In earlier bulletins it has been shown that when the quantity of irrigation water applied to crops is varied, the yields of the total crop as well as of the several plant parts vary quite definitely. The readiness with which plants respond to differences in irrigation is really remarkable and undoubtedly lies at the foundation of the future science of irrigation.

Variations in the quantities of irrigation water not only affect the total yield of dry matter, but also the composition of the plant itself. This fact was brought out many years ago in the investigations of this Station.