FIELD CROPS. 239 



Particulars regarding 9 varieties of cotton most commonly grown in 

 Egypt are given. The work of planting, irrigating, cultivation, and 

 harvesting is described in detail. The cost of growing cotton in 

 Egypt is estimated ;it $46 per acre and the returns from the crop at 

 $66 per acre. 



Potatoes, B. 0. Bufftjm ( Wyoming Sta. Bui. 32, pp. 70, pis. 3). — 

 The experiments conducted at the station and the several substations 

 comprise preparation of the soil for potatoes, methods of preparing seed, 

 growing potatoes at different altitudes, and variety tests. Planting, 

 cultivation, irrigation, cost and profit, and insect enemies and diseases 

 are discussed iii a popular manner. 



At the Lander Substation, a bottom laud plat yielded more than 

 twice the crop of the same varieties grown on an upland plat. 



Subsoiling for potatoes at three of the substations increased the yield 

 18.4, 18.5, and 21 per cent over unsubsoiled land. 



A fertilizer experiment with bone meal spread over the seed in the 

 furrow was inconclusive, as cold wet weather caused most of the seed 

 to rot. It was found in these experiments that seed treated for scab 

 with corrosive sublimate produced a good stand. Untreated seed 

 planted with bone meal produced a partial stand, while untreated seed 

 planted without bone meal failed to grow. It seems that corrosive 

 sublimate effectually prevented wet rot of the seed, while bone meal 

 was only partially effective. 



Green manuring with peas resulted in an increase in yield of more 

 than 38 per cent. 



The yield from small potatoes planted whole was greater than from 

 cuttings made of large potatoes, but the percentage of marketable 

 tubers was less from the whole seed. " Cutting the potatoes in quarters 

 lengthwise, so as to leave one-fourth of the seed end on each quarter, 

 has been practiced at the home station for the past 3 years, and where 

 the seed potatoes are not too large this method of cutting is recom- 

 mended." The potatoes planted 8 in. apart in the row gave the best 

 results. 



The time between planting and harvesting the crop at the station 

 and the several substations, although situated at different altitudes, 

 was about the same in each experiment, and variations in yield did not 

 correspond to variations in altitude. 



The specific gravity and percentage of starch of varieties grown at 

 Laramie and Sundance are given in a table. The average percentage of 

 starch for all the varieties was 14.1 at Laramie and 17.3 at Sundance. 

 "It is probable that the starch content of potatoes raised at high alti- 

 tudes will be less than at low altitudes." The altitudes of Laramie 

 and Sundance are 7,200 and 4,500 ft., respectively. 



The results of variety tests at the station and substations are tabu- 

 lated and a number of varieties are described in detail. The Blue 

 Victor is the best keeper among the varieties tested. " In a cellar or 



