EXERCISE 40 (Continued) 



What depth of mulch is most effective in conserving moisture and keeping down weed growth? How 

 many times and at what stages of growth should corn be cultivated? At what stage of development 

 should the crop be cultivated the last time or " laid by "? What principles should guide the farmer 

 in regard to the depth to cultivate corn, (a) when the plants are small ; (b) when the plants are 

 large and their roots have fully permeated the soil ; (c) in a wet season when there is a rank growth 

 of weeds to be killed ; (d) in a dry season when there are no weeds and the surface is covered with 

 a mulch ; (e) when a thin crust is formed on the surface ? Name the principal implements used in 

 tilling corn in the community. How many acres can a man till in a day, when the corn is small? 

 When it is ready to be "laid by"? 



References. Waters, H. J. Essentials of Agriculture, pp. 150-152. Ginn and Company. Duggae, J. F. 

 Southern Field Crops, pp. 1 58-188. The Macmillan Company. Morgan, J. O. Field Crops for the Cotton Belt, 

 pp. 245-251. The Macmillan Company. Myrick, Herbert. The Book of Corn, pp. 123-128. Orange Judd 

 Company. Montgomery, E. G. The Corn Crop, pp. 197-214. The Macmillan Company. Mosier, J. G., 

 and Gustafson, A. F. Bulletin 181 Illinois Experiment Station, Urbana. 



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