1917J FIELD CROPS. 441 



The height of the stalk of the plant increased with increased irrigation up to 

 30 in., but decreased with 40 in. of water. Unmanured com was decidedly 

 shorter than manured corn, but 5 tons of manure gave slightly higher stalljs on 

 the average than 15 tons. The longest ears were produced with no manure and 

 with 30 in. of water. The length and vndth of the leaves increased with an 

 increase of water up to 30 in., while manuring decidedly increased the leaf 

 measurements. 



Manuring greatly stimulated tillering, while the irrigation water was added 

 too late to affect tillering. The number of leaves per stalk and the number of 

 ears per plat increased with increased irrigation up to 20 in. and with manure. 

 The average number of branches per tassel was affected by the same condi- 

 tions that affected grain production. 



The nitrogen content of the grain was reduced by the same irrigation treat- 

 ments that increased crop yields, the percentage decreasing from 1.923 with no 

 irrigation to 1.901 with 20 in. Manure, on the other hand, as a rule, increased 

 the nitrogen percentage in the grain. In the total nitrogen per acre, however, 

 the highest average production was secured with 20 in. of water, and amounted 

 to 58.365 lbs. 



The phosphorus content of the grain was affected irregularly by irrigation, 

 but was increased by the manure. The calcium and magnesium content of the 

 grain was not regularly influenced by the treatments. 



From the results of the experiments, it was concluded that under similar 

 conditions 20 acre-inches of water is the best amount for corn production, and 

 that an annual application of 5 tons of manure per acre is sufficient for profit- 

 able corn production on Greenville soil. 



Cotton production and distribution, 1915-16 (Bur. of the Census [U. S.], 

 Cotton Prod. U. S.. 1916. pp. 99, figs. 14)- — Statistics are given on the supply 

 and distribution of cotton in the United States, cotton production in the United 

 States, consumption and stocks of cotton, imports and exports, the world's 

 production of cotton, the world's consumption of cotton, cottonseed products, 

 and cotton ginned by counties. Maps are given showing the cotton-producing 

 area of the United States in 1915 and the center of production for the period 

 of 1859 to 1914. the classification of States according to the quantity of cotton 

 consumed in 1916, and the production of cotton in 1915 by counties for Alabama, 

 Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, Oklahoma, 

 South Carolina, Tennessee, and Texas. 



Cotton in Brazil, W. W. Coelho de Souza (Lavoura: Bol. Soc. Nac. Agr. 

 [Brazil^, 20 (1916), No. 1-6, pp. 9-19). — A general discussion of the production 

 of cotton in Brazil. A brief history of the crop in Brazil is given. 



Cotton varieties in Brazil, E. C. Green (ClassiflcaQdo Summaria das Di- 

 ver sas E species de Algodoeiros Cultivadas no Brasil. Rio de Janeiro: de 

 Rodrigvcs d Co., 1916, pp. 14)- — This is a brief summary and description of the 

 cotton varieties grown in Brazil. 



Third report on the improvement of indigo in Bihar, A. and Gabrielle 

 L. C. Howard (Agr. Research Inst. Pusa Bui. 67 (1916), pp. 34, ph 1; abs in 

 Nature [London'\, 98 (1916), No. 2461, p. S35). — This is a supplementary report 

 of work previously noted (E. S. R., 34, p. 36). The principles imderlying the 

 production of natural indigo are discussed, as well as seed production and 

 improvement through selection and breeding. 



The authors state that since the best color is obtained from those plants 

 which secure their chief nitrogen supply from the root nodules good soil aera- 

 tion is the most important phase of cultivation. Further notes are given on 

 Indigo wilt, together with recommendations for its prevention. 



