232 



EXPERIMENT STATION RECORD. 



[Vol. 36 



tubers was greater than from large ones, but the largest crop was secured 

 from the use of medium-sized tubers for seed. The size of the seed tuber had 

 the same influence with early and late varieties. The yield of late potatoes 

 was from 75 to 100 per cent greater than that of early varieties. 



The cost of potato production in Russia, V. Kotelnikov (Selsk. Khoz. i 

 Ltesov., 249 (1915), Oct., pp. 213-243). — This article reports the cost of potato 

 production in rubles (0.515 cts.) per dessyatine (2.7 acres) for each of the 

 Governments of Russia. The data collected in this connection are presented 

 in tables. The average cost of production on large and small farms in 19 

 Governments is given in the table below: 



Average cost per dessyatine of producing potatoes in 19 Governments of Russia. 



Green-manuring rice, G. C Sherkaed (Agr. Jour. Bihar and Orissa [India], 

 3 {1915), 1^0. 1, pp. 66-68). — The results of green-manuring rice with san hemp 

 {Crotolaria juncea) and dhaincha (Sesbania aculeata) are reported for a series 

 of years on three different farms. 



The tabulated results show that green manuring gave an increase in the yield 

 of rice every year at each of the places where the work was conducted. It is 

 recommended that these green manuring crops be sown in, time to reach the 

 proper stage of development at the period when the land is ordinarily puddled, 

 that all of the green substance of the crops be mixed with and buried in the 

 mud, and that the rice be transplanted on the land thus prepared about a week 

 later. 



Nitrogenous fertilizers for winter rye, S. Hasund (Tidsskr. Norske Landbr., 

 23 (1916), No. 3, pp. 139-1^1). — Cooperative experiments with Norwegian lime- 

 nitrogen and Norwegian nitrate as a fertilizer for winter rye are described, and 

 the results are reported in tables. The applications used furnished equal quan- 

 tities of nitrogen. The use of Norwegian lime-nitrogen gave, in general, the 

 same crop increase secured from the applications of Norwegian nitrate. 



ractors influencing the protein content of soy beans, J. G. Lipman and 

 A. W. Blair (Soil Sci., 1 (1916), No. 2, pp. 171-178).— This is a continuation 

 of work already noted (E. S. R., 34, p. 140). 



It was found that thick ^seeding up to 20 and 30 plants per pot increased re- 

 turns as regards dry matter and total nitrogen, the latter fact seeming to indi- 

 cate increased or intensified utilization of atmospheric nitrogen by means of 

 symbiotic bacteria in case of the thicker plantings. It seems certain that by 

 thick seeding of soy beans, much more nitrogen is secured from a given area, 

 much of which is drawn from the atmosphere. 



In order to test whether, with abundant available nitrogen in the soil, legumes 

 draw less nitrogen from the air than when soil nitrogen is scanty, experiments 

 M'ere carried out with gradually increasing nitrogenous fertilizers. From these 

 experiments, in which both tops and roots gave the same sort of results, it is 

 concluded that in the sand cultures at least, nodule formation is not decreased 

 by applications of nitrogenous fertilizers. The plants evidently used some of 

 the applied nitrogen, but the excellent growth made by the checks would lead 



