Nature Teaching Based Upon the General Principles of Agriculture for the Use of
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It is worth noting that the common expressions * poor land ' and 4 rich land ' usually refer respectively to soils with little humus and soils with much humus in them.
3. Earth-worms are very active agents in distributing humus through the soil. They carry leaves down into their burrows and bring to the surface, and deposit there, large quanti- ties of earth in the form of castings. Darwin estimated that in an English meadow the earth-worms brought to the surface upwards of 15 tons of earth per... acre per year. Owing to this action of the earth-worms, objects lying on the surface are slowly buried or appear to sink into the ground. In 1842 Darwin spread a quantity of chalk over a field in order to ob- serve at a future date to what depth it had been buried. At the end of twenty-nine years a trench was dug across the field, when a line of white nodules were traced on both sides of it at a depth of seven inches below the surface. The mould, therefore, (excluding turf) had been thrown up at an average rate of "2*2 inches per annum through the agency of earth-worms It is estimated that the soil so brought up in this meadow weighed about 73, 000lbs.
What to read after Nature Teaching Based Upon the General Principles of Agriculture for the Use of?
You can find similar books in the "Read Also" column, or choose other free books by Francis Watts to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It is worth noting that the common expressions * poor land ' and 4 rich land ' usually refer respectively to soils with little humus and soils with much humus in them.
3. Earth-worms are very active agents in distributing humus through the soil. They carry leaves down into their burrows and bring to the surface, and deposit there, large quanti- ties of earth in the form of castings. Darwin estimated that in an English meadow the earth-worms brought to the surface upwards of 15 tons of earth per... acre per year. Owing to this action of the earth-worms, objects lying on the surface are slowly buried or appear to sink into the ground. In 1842 Darwin spread a quantity of chalk over a field in order to ob- serve at a future date to what depth it had been buried. At the end of twenty-nine years a trench was dug across the field, when a line of white nodules were traced on both sides of it at a depth of seven inches below the surface. The mould, therefore, (excluding turf) had been thrown up at an average rate of "2*2 inches per annum through the agency of earth-worms It is estimated that the soil so brought up in this meadow weighed about 73, 000lbs.
What to read after Nature Teaching Based Upon the General Principles of Agriculture for the Use of?
You can find similar books in the "Read Also" column, or choose other free books by Francis Watts to read onlineMoreLess
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