1917] FIELD GBOFS. 439 



after the application, and that this effect had almost entirely disappeared at 

 the end of four weeks. Notes are also given on the cost of fertilizing grass 

 lands, the feeding value of young grass, the artificial curing of grass, and the 

 production of forage on lawns and in parks. 



[Chlorin requirement of the buckwheat plant], T. Pfeiffee and W. Stmmkr- 

 MACHER (Landw. Vers. Stat., 88 (1916), No. 1-2, pp. 105-120) .—This article re- 

 views work on this subject by a number of investigators and describes a study 

 made by the authors to determine the relation of chlorin to the growth of the 

 buckwheat plant. In view of the results secured it is concluded that while 

 chlorin is a necessary plant food, the chlorin requirement of the buckwheat 

 plant is very small and that the presence in the soil of relatively large quan- 

 tities of chlorin compounds affects its growth injuriously. 



Com growing under droughty conditions, C. P. Habtley and L. L. Zook 

 (U. S. Dept. Agr., Farmers' Bui. 773 (1916), pp. 24, figs. i5).— This publication 

 deals with corn growing in dry-land r^ons, although the principles discussed 

 apply wherever com is produced. 



It is pointed out that while com is not naturally adapted to semiarid 

 regions owing to its heat requirements and peculiar flowering habits, it has 

 been introduced into dry-land agriculture because of its extensive production 

 in other regions and the advantages it presents in rotation with the small 

 grains. The chief essentials of corn growing are given as water, heat, soil 

 fertility, and seed, any one of which may, if lacking, become the limiting 

 factor to production. In the semiarid regions the limiting factor is for 

 the most part either water or heat, and the discussion is based, therefore, on 

 the best means of getting moisture into the soil and retaining it there until 

 the corn crop can make the most efficient use of it. The following points are 

 discussed in some detail from the standpoint of dry-land farming: Preparation 

 of the seed bed, time of planting, methods of planting, and cultivation. 



Corn growing under irrigation is briefly discussed, and some of the causes 

 for failures in this practice pointed out. The short growing seasons and 

 extreme differences between day and night temperatures are given as limiting 

 factors encountered, although they may be partly overcome by growing early 

 maturing adapted varieties. Some of the preventable causes for failure are 

 given as overirrigation, too frequent irrigations, too early irrigations, and too 

 little cultivation. 



Certain animal and insect enemies of the com crop are briefly mentioned, 

 together with general control measures. The necessity for good seed and the 

 choice of adapted varieties are discussed. 



The practice of pasturing com to hogs is recommended for semiarid regions, 

 .not only because of the labor saved in harvesting the crop but also because 

 the flint and flour varieties may thus be grown. 



Some factors influencing yield in maize, H. Wenholz (Agr. Gas. N. S. 

 Wales, 26 (1915), No. 12, pp. 1023-1029).— This article deals in a popular way 

 with the meteorological conditions under which maize is produced in New South 

 Wales. The time and method of planting are noted, together with the selection 

 of adapted varieties and good seed. The preservation of seed between seasons 

 is discussed in some detail. 



Hulled oats, P. O. Overgaabd (Tidsskr. Planteavl, 23 (1916), No. 1, pp. 84- 

 102, fig. 1 ) . — The results of experiments on the seed value of hulled oats showed 

 that oats hulled in the process of threshing and sown mixed with normal oats 

 are worthless for seeding purposes when soil conditions are unfavorable for 

 germination or when the seed is subject to insect attacks. Under favorable 

 conditions hulled oats in a mixture gave up to 50 per cent of the production of 

 82992°— 17 4 



