The Soil An Introduction to the Scientific Study of the Growth of Crops
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I 93-5 49. O 207 35-7 159*3* 28. 2 102 4 * Partly derived from the atmosphere.
It is clear from a comparison of this table with the quantities previously specified, that even the poorest soil contains the nutrient material required by any ordinary crop many times over, yet we know that crops respond vigorously to dressings of manure which only add a fraction to the plant food already stored in the soil. For example, a wheat crop on poor soil would often be doubled by the use of 2 cwt. Of nitrat...e of soda per acre, i. E. , by the addition of 35 lbs. Of nitrogen in nitrate of soda to a soil that already contained in the top 9 inches more than 2000 lbs. Per acre. Again, 4 cwt. Per acre of superphosphate, containing about 60 lbs. Of phosphoric acid, will be necessary in the usual rotation to secure a good swede crop, though there may be already 2000 to 3000 lbs. Of phosphoric acid in the soil. We are then driven to conclude that the nitrogen, potash, and phosphoric acid are present in the soil in some other mode of combination than the form in which they exist in manures ; so that although they may be in the soil VI.
What to read after The Soil An Introduction to the Scientific Study of the Growth of Crops?
You can find similar books in the "Read Also" column, or choose other free books by Daniel Hall to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
I 93-5 49. O 207 35-7 159*3* 28. 2 102 4 * Partly derived from the atmosphere.
It is clear from a comparison of this table with the quantities previously specified, that even the poorest soil contains the nutrient material required by any ordinary crop many times over, yet we know that crops respond vigorously to dressings of manure which only add a fraction to the plant food already stored in the soil. For example, a wheat crop on poor soil would often be doubled by the use of 2 cwt. Of nitrat...e of soda per acre, i. E. , by the addition of 35 lbs. Of nitrogen in nitrate of soda to a soil that already contained in the top 9 inches more than 2000 lbs. Per acre. Again, 4 cwt. Per acre of superphosphate, containing about 60 lbs. Of phosphoric acid, will be necessary in the usual rotation to secure a good swede crop, though there may be already 2000 to 3000 lbs. Of phosphoric acid in the soil. We are then driven to conclude that the nitrogen, potash, and phosphoric acid are present in the soil in some other mode of combination than the form in which they exist in manures ; so that although they may be in the soil VI.
What to read after The Soil An Introduction to the Scientific Study of the Growth of Crops?
You can find similar books in the "Read Also" column, or choose other free books by Daniel Hall to read onlineMoreLess
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