238 MASS. EXPERIMENT STATION BULLETIN 194. 



One change was made in the fertilizers in the spring of 1912, when the 

 quantity of acid phosphate was increased so that the low, medium and 

 high amounts were, respectively, 10, 15 and 20 pounds, instead of 4.44, 

 6.67 and 8.89, as tabulated. 



The chemicals were standard high-grade materials, and were analyzed 

 each year to check their guarantees. 



Acid phosphate contained 14 per cent soluble and available phosphoric 

 acid. Wood ashes carried slightly more than 5 per cent of potash. The 

 stable manure varied but httle from 70 per cent moisture, 0.7 per cent 

 nitrogen, 0.5 per cent phosphoric acid, and 0.7 per cent potash. 



The asparagus was cut regularly and prepared for market. The weights 

 were made before the stalks were bunched and trimmed, and the yields 

 therefore include the butts and waste stalks with the marketable crop. 

 No data were secured from which to estimate the probable marketable 

 bunches per plot, but the estimate of practical growers is that the waste 

 involved in preparation for market constitutes about one-fifth of the total 

 weight cut. 



The attack of summer rust in 1910 caused the affected plots to produce 



