308 



STATE BOARD OF AGRICULTURE. 



TABLE 1, BEAN VARIETAL SERIES 1912-1914 

 Percentage Yields of Robust (81302) 



Variety. 



1912. 



1913. 



1914. 



Av. %. 



Bus.* per A. 



Robust 



82103 



Cook 



No. 81901 



Shoesmith 



No. 84204 



Landis Untreated 



Landis Inoculated 



Landis 1-300 Formalin. 

 Landis 1-500 HgC12. . . 



Boston 



Scully '. 



White Kidney 



Ogemaw Soy 



Red Kidney 



Early Bluff Cow Peas . . 

 Geismar 



100.00 

 79.44 

 64 . .54 

 75.00 



74.77 

 68.77 

 62.24 



54 . 54 



42.08 

 51.19 

 50.13 

 15.31 



100.00 

 73.50 

 71.96 

 67 . 95 

 62.48 

 66.47 

 • 56.45 

 38 . 03 

 48 . 03 

 65 . 22 

 58.13 

 47.19 

 57.72 

 39.65 

 48.61 

 62.87 



100.00 

 52.13 

 63 . 25 

 54.48 

 57.40 

 44.89 

 48.00 

 44.88 

 43.79 

 46.28 

 53.12 

 46.90 

 37 . 90 



33.27 



12.78 

 25 . 78 



100.00 

 68.36 

 66 . 58 

 65.81 

 61.55 

 60.04 

 55.56 

 41.45 

 45.91 

 55 . 75 

 55.26 

 47.04 

 45 . 90 

 45.42 

 44.00 

 30.32 

 25.78 



35.0 

 23.9 

 23.3 

 23.0 

 21.5 

 21.0 

 19.4 

 14.5 

 16.1 

 19.5 

 19.3 

 16.5 

 16.0 

 15.9 

 15.4 

 10.6 

 9.0 



= 1.1 

 = 1.0 



=tl 



±1 

 =tl 

 ±1 



=t0.8 



±1.0 



±1.0 



±1.0 



±0 



±1 



±0 



±0 



±0 



±0 



±1 



*The probable errors are asked for by experiment station workers generally, and are given here in 

 connection with the yields in bushels per acre. They indicate that these results are expected to be 

 correct within a bushel either way. 



The results are expressed as percents of Kobnst and sliow that the 

 Robust produces one and a lialf times tliat of the liighest yiehling com- 

 mercial variety in the series. The results also show that the other se- 

 lections of 1908 were inferior to Robust. The varietal testing work was 

 discontinued at this point because the Robust variety had demonstrated 

 its superiority so conclusively and because the other work demanded the 

 use of all land then available. 



DIFFERENT STRAINS OF ROBUST. 



The Robust (81302) that was used up to this point and distributed in 

 1915, was further selected in 1911, and tested in plant-rows in 1915. Five 

 of these 'strains No. 40509, No. 40511, No. 40515, No. 40516, and No. 40520 

 were increased in 1910 and entered the varietal series in 1917. 



Thus it happened that a new selection of Robust (No. 40511) became 

 the check in the 1917-1920 yield series, and that other strains of Robust 

 were included in that series to determine the relative yielding power of 

 the different strains. The principal part of the new varietal series was 

 composed of farmers' varieties from the bean sections. 



The check in the 1912-1914 varietal series h&d been Robust (81302). 

 As this was the Robust that was distributed in 1915 and has since been 

 sold by the Michigan Crop Improvement Association, we wisihed to know 

 the relative yielding power of the old strain (No. 81302) and the new 

 (No. 40511). 



This question arose in 1917 in connection with the inspection of and 

 certificatiou of the Robust beans. For this purpose the growers of pedi- 

 greed Robust (No. 81302) beans were requested to submit a sample of 

 their (beans to be planted in the College varietal series in 1918. These 

 samples were grown in duplicate jilats and each pair of results averaged. 

 The results are expressed as percents of the new check (Robust No. 

 40511) and are as follows. 



