296 SOIL SCIENCE [Bot. Absts., Vol. V, 



2269. Forman, L. W. Reclaiming Iowa's "push" soils. Iowa Agric. Exp. Sta. Bull. 191 : 

 162-176. 5 fig. 1919. 



2270. Frear, William. Some notes of fertilizers and the war. Bull. Pennsylvania Dept. 

 Agric. I 1 : 29-33. 1918. — A brief summation of the past and present sources of supply of pot- 

 ash, nitrogen and phosphoric acid with remarks concerning the difficulties which are being 

 encountered among the domestic manufactures of fertilizers.— C. R. Orton. 



2271. Harrison, W. H. Report of the Imperial Agricultural Chemist. Sci. Rept. Agric. 

 Res. Inst. Pusa 1918-19: 35^45. 1919. — A summary of the work carried on during the year at 

 the Agricultural Research Institute, Pusa, India, and a program for 1919-20. From studies 

 in the method of retention of superphosphate in soil, it is concluded that the phosphate is 

 held in non-calcareous soils by absorption, and in calcareous soils by chemical combination, 

 and therefore the range of application and method of employment of superphosphate as fer- 

 tilizer must be different in the two types of soil. — Sugar cane (Saccharum officinarxim) stored 

 in windrows in the North-West Frontier Province shows increasing content of both glucose 

 and sucrose, but other changes render the final sucrose jaeld nearly constant with continued 

 storage. Immediately following heavy rainfall there is rapid deterioration of the cane. — 

 In fertilizer experiments with rice (Oryza sativa), green manure combined with ammonium 

 sulphate gave an increase in yield almost exactly proportional to that given by sulphate alone. 

 — Winfield Dudgeon. 



2272. Jacob, A. Beeintrachtigung der Bodenstruktur durch Kochsalz-Diingung. [In- 

 jury of the soil structure through applications of sodium chloride.] Illustrierte Landw. Zeitg. 

 39:420-421. 1919. 



2273. Jordan, W. H., and G. W. Churchill. An experience in crop production. New 

 York Agric. Exp. Sta. [Geneva] Bull. 465. 20 p. 1919.— See Bot, Absts. 5, Entry 1164. 



2274. Mitscherlich, Eilh. Alfred. Zum Gehalt der Haferpflanze an PhosphorsSure 

 und seinen Beziehungen zu der durch eine Nahrstoffzufuhr bedingten Ertragserhohung. [On 

 the phosphoric acid content of the oat plant and its relation to the increased yield resulting 

 from the addition of nutrients.] Jour. Landw. 67: 171-176. 1 fig. 1919. 



2275. Munter. Pflanzenanalyse und Dungerbediirfnls des Bodens. [Plant analysis 

 and fertilizer requirement of the soil.] Jour. Landw. 67: 229-266. 1919. — The following re- 

 sults reported were obtained on the Lauchstedt loessal loam soil with winter wheat when fer- 

 tilized with different materials: Fertilizing with potassium and phosphoric acid increased 

 the silicic acid content of the straw, fertilizing with nitrogen decreased it, — Fertilizing with 

 potassium and phosphoric acid decreased the nitrogen, calcium and magnesium content of 

 the straw; nitrogen increased it. — The nitrogen content in the grain was decreased by potas- 

 sium and increased by phosphoric acid. — The chemical analysis of the wheat plants of a fer- 

 tilized plat gave no sure indication of the fertilizer need of the soil. — The better the growing 

 season, the more does nitrogen control the formation of organic substance, especially in the 

 grain, therewith the total calcium, magnesium, potassium and phosphoric acid taken up. 

 In poorer growing seasons potassium influences more the plant production. Phosphoric acid 

 is apparently indifferent. — Nitrogen, potassium or phosphoric acid used alone first influences 

 the straw. — The weather condition of any year exerts a strong influence upon the taking up 

 of nitrogenous matter, sometimes even more than the fertilizer applied, thereby rendering 

 the percentages of nitrogen resulting from incomplete fertilizer applications unreliable in 

 indicating fertilizer needs of the soil. — The nitrogen requirement of the Lauchstedt soil may 

 be determined by the quantities of N, CaO, and MgO in the wheat plant. When the sum of 

 N, CaO and MgO ingrain and straw fori hectar amounts to more than 90 kgm., or in grain more 

 than 60 kgm., or in straw more than 30 kgm., then there is sufficient nitrogen present in the 

 soil. — If after subtracting the sum of the N-f- CaO+MgO percentages from the potassium per- 

 centage the result is positive, the potassium content of the soil is sufficient for plant produe- 



