IMPROVEMENT OF GHIEKA SPRING WHEAT. 



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The season of 1908 was a favorable one in regard to rainfall at all 

 the stations here considered. Rather conflicting results were ob- 

 tained with the Ghirka wheat at the different stations. The prm- 

 cipal agreement in the tests was the outstanding yield of the Kubanka, 

 surpassing the other varieties of wheat at Williston, Brookings, 

 Highmore, and NeweU, and equaling the yields of the Haynes and 

 Ghirka Spring for first 

 place at Moccasin and ^-J^^- ^i/^ff^se y/£ld //v 



ickmson, respect- 

 ively. The Ghirka 

 outyielded the other 

 varieties at Edgeley, 

 but, on the other 

 hand, gave the lowest 

 yield at Brookings, 

 Highmore, and New- 

 ell. The exception- 

 ally low yield of the 

 Ghirka at Highmore 

 and Brookings was 

 due, in part at least, 

 to rust. The average 

 yield at the seven 

 stations showed Ku- 

 banka first, Rysting- 

 Glyndon second, 

 Haynes third, and 

 Ghirka fourth. 



The season of 1909 

 was unusually favor- 

 able at all the sta- 

 tions. Kubanka 

 durum wheat gave the 

 highest yields at Moc- 

 casin, Williston, Dick- 

 inson, Edgeley, and 

 Newell. The Ghirka 

 led at Brookings and 

 Highmore, ranked second at Moccasin, tliird at Williston, and fourth 

 at Dickinson, Edgeley, and Newell. Under the humid conditions of 

 this year rust again caused a n^duction in the yield of the Ghirka. 

 For all stations the Kubanka ranked first, Ghirka second, Haynes 

 third, and Kysting-Glyndon fonrlii. 



The dry season of J910 n-duccd the yields at all stations, and the 

 results were entirely different from those obtained in previous years. 



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Fig. 3. — Diagram showing the average yields of four varieties of 

 spring wheat and the annual and seasonal precipitation at seven 

 experiment stations in the northern Great Tlains area for the 

 7-ycar period from 1908 to 1!U4, inclusive. 



