. Agriculture for southern schools. tton: — Plant one third of the land in cotton; one third incorn, with cowpeas sown later between the corn rows(Fig. 72,); and one third in oats or wheat, planting cowpeasin June after the grain is harvested. This is called a three-year rotation, because at the end of three years each ROTATION OF CROPS 119 field starts over again with the same crop. The cow-peas grown between the corn rows fertilize the oats,which is the nextcrop. The cow-peas planted justafter the oats arecut may bepicked or cut forhay or no matterwhat way theyare used, they fer-t
. Agriculture for southern schools. tton: — Plant one third of the land in cotton; one third incorn, with cowpeas sown later between the corn rows(Fig. 72,); and one third in oats or wheat, planting cowpeasin June after the grain is harvested. This is called a three-year rotation, because at the end of three years each ROTATION OF CROPS 119 field starts over again with the same crop. The cow-peas grown between the corn rows fertilize the oats,which is the nextcrop. The cow-peas planted justafter the oats arecut may bepicked or cut forhay or no matterwhat way theyare used, they fer-tilize the succeed-ing crop of cot-ton. Of course,phosphate, andsometimes pot-ash, will needto be purchasedto help fertilizethe crops. Thuscotton followingcowpeas on onlyone third of thecultivated landwill usually produce as many bales as when half or moreof the cultivated land is used for cotton and only a fewcowpeas grown. Each year let corn follow cotton; sow oats or wheaton the field that has just borne a crop of corn and cow-. FlG. 73. -Cowpeas sown between the Rows opCorn I20 AGRICULTURE peas; and plant cotton every year where oats or wheat(and afterwards cowpeas) grew the year before. Studythe following diagrams until this order of. cropping isunderstood. Under this rotation the soil bears a soil-improving croptwo years out of every three and the farm becomes richeryear by year. A soil-improving crop can be grown everyyear by sowing crimson clover, vetch, or bur clover inSeptember among the cotton plants. ... , If a farmer wishes half his cultivated area to be incotton, he can easily do this by growing cotton two yearsin succession, changing the three-year to a four-year rota-tion. In a four-year rotation each field bears the samecrop in the fifth year as in the first. The smaller areasused for peanuts, sweet potatoes, vetches, sorghum, water-melons, and other minor crops are rotated on differentparts of a single field near the barn, letting crops that addnitrogen to th
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