Feb. 9.1924 Effect of Fertilizers on Stem Rust of Wheat 377 
On some soils, and under certain weather conditions, heavy fertilization 
with nitrogen decreases yield greatly by increasing the proportion of 
straw to seed, by inducing lodging and burning out. This probably 
has been confused with rust injury. 
On soils deficient in nitrogen, barnyard manure and nitrates increased 
yields without increasing the severity of attack by stem rust. 
Neither acid phosphate nor potassium counteracted the harmful effects 
of excessive fertilization with nitrogen on some soils. 
On properly fertilized soil wheat yielded well in spite of heavy attacks 
of stem rust. 
While the direct effect of fertilizers on the development of stem rust 
seems to be slight, there is sometimes a profound indirect effect. It is 
advisable, therefore, to avoid excessive fertilization with nitrogen and to 
use phosphates and potassium fertilizers on those soils which need them. 
Rust damage can be reduced in this way. 
LITERATURE CITED 
(1) Anderson, H. C. L. 
1890. rust in wheat. In Agr. Gaz. N. S. Wales, v. 1, p. 81-92. 
(2) Armstrong, S. F. 
1922. THE MENDELIAN INHERITANCE OF SUSCEPTIBILITY AND RESISTANCE TO 
YELLOW RUST (PUCCINIA GLUMARUM, ERIKSS. AND HENN.) IN WHEAT. 
In Jour. Agr. Sci., v. 12, p. 57-96. List of papers referred to in text, 
p. 96. 
(3) Arthur, J. C. 
1903. problems in the study of plant rusts. In Bui. Torrey Bot. Club, v. 
30,, p. 1-18. 
(4) Biffen, R. H. 
1912. STUDIES IN THE INHERITANCE OF DISEASE RESISTANCE. II. In Jour. 
Agr. Sci., v. 4, p. 421-429. 
{5) BollEy, H. L. 
1889. wheat rust. Ind. Agr. Exp. Sta. Bui. 26, 18 p., 9 fig. 
(6) Butler, E. J. 
1918. fungi and diseases in plants. 547 p., illus., pi. Calcutta. Bibliog¬ 
raphy, p. 518-531. 
(7) Comes, Orazio. 
1913. DELLA RESISTENZA DEI FRUMENTI ALLE RUGGINI STATO ATTUALE DELLA 
quistionE e provvedimenti. In Atti. R. 1 st. d’Incor. Napoli, ser. 6, 
v. 64, p. 419-441. Letteratura e note, p. 437-440. 
(8) Freeman, E. M., and Johnson, E. C. 
1911. the rusts of grains in the united states. U. S. Dept. Agr. Bur. 
Plant Indus. Bui. 216, 87 p., 2 fig., 1 pi. Bibliography, p. 7^-82. 
(9) Fromme, F. D. 
1913. THE CULTURE OF CEREAL RUSTS IN THE GREENHOUSE. In Bui. Torrey 
Bot. Club, v. 40, p. 501-521. Literature, p. 519-521. 
(10) Gassner, Gustav. 
1915. UNTERSUCHUNGEN tfBER DIE ABHANGIGKEIT DES AUFTRETENS DER 
GETREIDEROSTE VOM ENTWICKLUNGSZUSTAND DER NAHRPFLANZE UNB 
von AuszerEn faktorEn. In Centbl. Bakt. [etc.], Bd. 44, p. 512- 
617. Bibliographical footnotes. 
(11) Gibson, C. M. 
1904. NOTES ON INFECTION EXPERIMENTS WITH VARIOUS UREDINEAE. In New 
Phytol., v. 3, p. 184-191, pi. 5-6. 
(12) Hiltner, L. 
1914. NEUERE BEOBACHTUNGEN tiBER DEN ROSTBEFALL DES WINTERGETREIDES. 
In Prakt. Bl. Pflanzenbau u. Pflanzenschutz, Jahrg. 17 (n. F. 12), 
p. 81-84. 
(13) Hurd, Annie May. 
1923. HYDROGEN-ION CONCENTRATION AND VARIETAL RESISTANCE OF WHEAT 
TO stemrust and other diseases. In Jour. Agr. Research, v. 23, 
p. 373-386. Literature cited, p. 384-386. 
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