SOILS PERTTLTZEES. 



827 



tiirftir. Tidshr., 21 {1907), Xo. 3, /*/). 2t0-.l'i7). — The experimeuts included 



trials of soil amendnieuts (sand or clay), liming, fertilizer, and variety tests 



with small grains, green foi*age, and root crops. 



On the question of the different correlations between lime and magnesia 



in the nutritive solution (theory of O. Loew), I. Konovalov (Zhur. Oimitu. 



Aaron. [Ru.-i.s. Jour. Expt. Lainlic], S (1907), No. 3, pp. 257-280). — The author 



reports studies of this question with barley, millet, oats, and maize. In sand 



cultures with oats and millet the nutritive solution contained per kilogram of 



sand 0.584 gm. calcium nitrate, 0.153 gm. mono-potassium phosphate, 0.075 gm. 



potassium chlorid, 0.1S4 gm. magnesium sulphate, and 50 mg. of iron as phos- 



13.4 6^ 



1 ' 1 



3.3 1.6 0.8 0.4 ^, , „ . 



-y^ 3~' ~]7' 'Y' T- The following yields were obtained: 



phate of iron. The ratios of lime and magnesia varied as follows: 



Yields of millet and oats with different ratios of lime and magnesia. 



CaO:MgO: 

 13.4:1_— 

 6.7:1__- 

 3.3:1-— 



1.6:1 



.8:1— 



.4:1_-. 



No lime 



Total yield of air- 

 dry substance. 



Millet (6 

 plants) . 



Grams. 

 59.18 

 60.27 

 .38.73 

 51.43 

 41.86 

 31.67 

 4.47 



Oats (7 

 plants). 



Grams. 

 45.46 

 63.67 

 52.14 

 47.94 

 46.12 

 42.04 

 25.56 



Yield of grain. 



Millet (6 

 plants) . 



Xor- 

 mal. 



Orams. 

 15.06 

 15.09 

 15.:38 

 13.65 

 10.79 

 1.60 



Poor. 



Oats (7 plants), 



Nor- 

 mal. 



Orams. iOrams. 

 6.56 

 11.06 

 12.45 

 11.30 

 2.67 

 1.65 

 .02 



0.91 

 1.81 

 2.50 



Poor. 



Orams. 

 3.55 

 5.71 

 4.64 

 3.53 

 7.40 

 6.04 

 3.08 



Yield of straw. 



Millet (6 

 plants). 



Orams. 

 44.11 

 45.24 

 43.15 

 37.78 

 31.07 

 30.07 

 4.47 



Oats (7 

 plants). 



Grams. 

 35.36 

 46.90 

 35.06 

 33.17 

 36.02 

 34.35 

 22.47 



Mean weight 



of 1,000 norma! 



grains. 



Millet. 



Grams. 

 5.46 

 5.54 

 5.34 

 5.22 

 4.78 

 3.48 



Oats. 



Orams. 

 35.24 

 39.73 

 38.70 

 37.88 

 35.08 

 33.20 

 24.35 



These data clearly show that the more lime there is in the nutritive solution, 

 the quantity of magnesia remaining the same, the greater the yield of both 

 millet and oats, until the ratio of lime to magnesia becomes 6.7 : 1. When this 

 ratio is exceeded the yield of millet decreases somewhat, and that of oats very 

 considerably, there being a falling off in 3'ield of both gi-ain and straw and the 

 mean weight of the grain. 



In water cultures with maize and barley the nutritive soluti(m contained per 

 liter of water 1..33 gm. of calcium sulphate. 1.442 gm. potassium nitrate, 0.434 

 gm. dicalcium phosphate, 0.206 gm. nuignesium chlorid, and 100 mg. iron as 

 phosphate. The following yields were obtained: 



Yields of maize and harU ij irith different ratios of lime and mai/nesia. 



The maximum yield of organic matter was obtained in case of barley when 

 the ratio of lime to magnesia was 3.3 : 1 and in case of maize when the ratio 



