The United States Facts And Figures Illustrating the Physical Geography of the
The United States Facts And Figures Illustrating the Physical Geography of the
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doing, they have moistened the soil to a considerably greater depth than was reached by the rain-water before, and as a consequence the annual evaporation has greatly increased. The irrigation water, moreover, has brought with it from these depths all the supply of alkali salts that before had gradually been washed be- yond the reach of the ordinary rainfall by an occasional wet season. Each succeeding irrigation, followed by evaporation, tends to accumulate the salts nearer the surface, so tha...t finally the root-crowns of the grain crops are ' burnt up' before even beginning to head. The evil will, of course, be greatly aggravated if the water used for irrigation originally contains any considerable amount of alkaline salts, which are superadded to those already in the soil strata. " The subject of the origin of the " reh" or alkali on irrigated lands is discussed at some length in Professor Hilgard's report, and the following quotation from that document will give, in a few words, his most essen- tial conclusions, so far as they relate to the question of the difficulties of the irrigation problem : " From the facts above given regarding the alkali soils and irrigation waters of California, the importance of inves- tigating thoroughly not only the quantity but also the quality of the water available for irrigation in the arid regions, is sufficiently obvious.
What to read after The United States Facts And Figures Illustrating the Physical Geography of the?
You can find similar books in the "Read Also" column, or choose other free books by J D Josiah Dwight Whitney to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
doing, they have moistened the soil to a considerably greater depth than was reached by the rain-water before, and as a consequence the annual evaporation has greatly increased. The irrigation water, moreover, has brought with it from these depths all the supply of alkali salts that before had gradually been washed be- yond the reach of the ordinary rainfall by an occasional wet season. Each succeeding irrigation, followed by evaporation, tends to accumulate the salts nearer the surface, so tha...t finally the root-crowns of the grain crops are ' burnt up' before even beginning to head. The evil will, of course, be greatly aggravated if the water used for irrigation originally contains any considerable amount of alkaline salts, which are superadded to those already in the soil strata. " The subject of the origin of the " reh" or alkali on irrigated lands is discussed at some length in Professor Hilgard's report, and the following quotation from that document will give, in a few words, his most essen- tial conclusions, so far as they relate to the question of the difficulties of the irrigation problem : " From the facts above given regarding the alkali soils and irrigation waters of California, the importance of inves- tigating thoroughly not only the quantity but also the quality of the water available for irrigation in the arid regions, is sufficiently obvious.
What to read after The United States Facts And Figures Illustrating the Physical Geography of the?
You can find similar books in the "Read Also" column, or choose other free books by J D Josiah Dwight Whitney to read onlineMoreLess
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