Corn; growing, judging, breeding, feeding, marketing; for the farmer and student of agriculture, a text-book for agricultural colleges and high schools . hed cottonand tobacco lands of the south, the wheat lands of the northwest, whichnow produce but a fraction of the yields that they once did, and therun-down farms so numerous throughout the corn belt, all stand as areproach to the wasteful cropping systems followed. The continuous growing of a single crop upon the same land yearafter year causes *15th Bi. Report Kansas Station, Board of Agriculture, Page 3&5. HUMUS. 93 (i) A great deteriorat
Corn; growing, judging, breeding, feeding, marketing; for the farmer and student of agriculture, a text-book for agricultural colleges and high schools . hed cottonand tobacco lands of the south, the wheat lands of the northwest, whichnow produce but a fraction of the yields that they once did, and therun-down farms so numerous throughout the corn belt, all stand as areproach to the wasteful cropping systems followed. The continuous growing of a single crop upon the same land yearafter year causes *15th Bi. Report Kansas Station, Board of Agriculture, Page 3&5. HUMUS. 93 (i) A great deterioration in the physical condition of the soil. (2) A waste of the soil fertility, especially of the humus andnitrogen. (3) An increase of the weed enemies and the insect pests thatattack the crop, and as a result of all these, decreased crop yields. HUMUS. The productive capacity of most of the land of the Land must corn belt is largely measured by its physical condition and its content ^l^^ of humus and nitrogen. Deterioration in the physical condition of condition a soil is accompanied by soil washing and lessening of its water-hold- retuSr*^°*. (Courtesy Kemp & Burpee) Fig. 20. MANURE SPREADER IN OPERATION ON PASTURE LAND WHICH IS TO BE PLANTED TO CORN THE NEXT YEAR. ing capacity. These results are brought about by the rapid exhaustionof the humus. The frequent cultivation which is given the corn croppromotes the aeration of the soil and thus permits the organic matterto be rapidly oxidized. The humus serves as a binding material tohold the soil particles together. In fine grained soils, such as clays,it gives a more loamy texture, such as is seen in soils which arein good condition. Such soils will not bake or become cloddy, or runtogether when wet, and are not so subject to washing as soil contain-ing less organic matter. Humus also helps to fill the otherwise too 94 CORN. Humus absorbs and holds moisture Continuous cropping influences humus supply Nitrogen a valuable element
Size: 1936px × 1291px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1900, bookdecade1900, booksubjectcorn, bookyear1908
