822 EXPERIMENT STATION RECORD. [Vol. 40 



sorts of crops were grown together, one-half of the number of plants of each 

 kind was used as when they were grown alone. 



In 1914, a clay loam soil which had been composted with manure and left in 

 a pile for several years was limed, brought to an optimum moisture content, 

 and about 45 kg. introduced into each pot. Spring oats, spring barley, spring 

 rye and dwarf Kafir corn were each grown in association with hairy vetch, 

 field peas, and red clover. Corn was also grown with both oats and pearl 

 millet. Each crop was also grown alone. Summarizing the results obtained, 

 It is stated that a distinct loss of nitrogen in the soil followed a combination of 

 barley and peas, rye and peas, rye and clover, and corn and millet, while there 

 was a distinct gain with barley and vetch, barley and clover, oats and peas, 

 oats and clover, and Kafir corn and vetch. In general, combinations of barley 

 and vetch, barley and clover, oats and vetch, oats and peas, and Kafir corn 

 and vetch produced more nitrogen and dry matter than wh-en these crops were 

 grown alone but did not remove so much nitrogen from the soil. Barley showed 

 a gain in the percentage of nitrogen with vetch and peas and a loss with clover ; 

 rye lost slightly with vetch and clover and gained slightly with pens; while 

 oats and Kafir corn both gained with vetch, peas, and clover. At the same 

 time, vetch gained in nitrogen with barley, rye, and Kafir corn, but lost with 

 oats; field peas gained with barley but lost with rye, oats, and Kafir corn; 

 while red clover gained with barley, rye, and oats but lost with Kntir corn. A 

 loss in nitrogen was observed in corn grown with both millet and oats, while 

 the millet gained slightly and the oats lost materially. 



The 1915 experiments were planned to observe the comparative results with 

 a few plant combinations on different types of soil. Consequently, spring oats, 

 spring barley, Kafir corn, soy beans, and purple vetch were grown on a coarse 

 gravelly virgin loam from near Riverside, Cal., representing a Bemlarld soil; 

 a heavy black virgin loam from near Manhattan. Knus., representing the Great 

 Plains; and a practically virgin clay loam from Dear Arlington, representing 

 eastern humid soils. In all other respects the experiments were conducted as 

 in 1914. Summarizing the results it is stated that the percentage of nlttf 

 in oats increased with soy beans and vetch on all soils except in the case of 

 soy beans on the Virginia soil. Barley lost in nitrogen with soy beans on 

 all soils, gained with vetch on the California soil, lost on the Kansas soil, 

 and remained unchanged on the Virginia soil. Kafir corn gained with soy 

 beans and vetch on all soils, except with soy beans on the Kansas soil. Soy 

 beans gained in nitrogen on all soils when grown with oats and barley, while 

 with Kafir corn a gain occurred on the California soil and a loss on the Kansas 

 and Virginia soils. Vetch showed a gain with oats on the California soil and 

 a loss on the Kansas and Virginia soils, and a loss with barley and Kafir corn 

 on all soils. 



Experiments with soil and cultures as inoculating material for lupines and 

 vetch on upland moor soils, H. von Feflitzen (Svcnska Mosxkulturfnr. Tidskr., 

 .53 (1919), A T o. 1, pp. 55-45, figs. 6). — Pot experiments with lupines and vetch on 

 soil from an uncultivated upland moor region are described. The soil was 

 either untreated or treated with pure cultures of the root nodule bacteria of 

 lupines and vetch, or with soil from fields on which these crops developed 

 numerous root nodules and produced large yields, or with nitrate of soda at 

 the rate of 75 kg. per hectare (67 lbs. per acre). 



In the experiments with lupines, conducted in triplicate, the following aver- 

 age yields per pot of green substance were secured from the different series 

 of pots: Uninoculated 88 gm., Inoculated with soil 133 gm., Inoculated with 

 Barthel's culture 145 gm., and treated only with nitrate of soda 123 gm. It 



