849 



Experiment Xo. 10. — Roofprunhif/ (pp. 66-68). — "Every alternate row 

 of 18 rows li rods long, of each of the 4 plats used in experiment number 

 9, was root pruned three times from June 19 to July 10, to a depth of 4 

 inches. The pruning- was done by placing around each hill a frame 113 

 inches square on the outside and passing around its outer edge a ganged 

 knife." 



The results are stated in detail in a table. Tiie following is a sum- 

 mary of experinieuts iii this line during 4 years: 



Yields of corn with and without root pruninfi, lSSS-01. 



Experiment No 11. — Gorn^ effect of fertilizers (p. 68). 



A.s stated in former bulletins, no important etfect on yield of corn has been jtro- 

 duccd by the application of an*' of the more common forms of artificial manures to 

 the fertile prairie lands on the university farms. The application of stable manure 

 has, almost without exception, increased the yield, but not in all cases enouj^h to 

 repay directly the outlay. * * » 



l^or 3 years experiments have been tried at different iioints in this State, about in 

 the latitude of St. Louis, in tlie linjht-colored soil of that region. Owing to unfavora- 

 ble conditions — drouth and storms — or to injuries by insects the results have been 

 very unsatisfactory. The elfect of applying stable manure has been uniformly good. 



Experiment No 90. — Corn, increase of dry matter with the growth of the 

 plant (pp. 68, 69). 



For 3 years observations have been made on the rate of growth and on tiie rate of 

 increase of dry matter in the corn plant. The results each year have shown that 

 there is relatively very little dry matter in the corn plant in the early stages of its 

 growth. * * * For 3 years plats of corn have beeu cut for tbdder at three dirter- 

 ent periods — as nearly as might lie when the ears were in the milk stage, when they 

 were nearly mature, and when the plant was fully ripened. In each year there was a 

 noticeably smaller yield, both of the whole croji and of the grain, from the early-har- 

 vested jdats than from either of the others. The yield of corn has been largest from 

 the fully ripened jdats. These exi)eriments, and the feeding tests which have 

 accompanied them, will be repeated and fully rejiorted. 



Experiment No. 134. — Corn, effect of removing tassels (p. 69). 



The tassels on alternate rows of four tenths of an acre of JJurr White corn were 

 removed as soon as they appeared. Each of the 30 rows was husked and weighed sep- 

 arately. Tlie total difference between those having the tassels removed and those not 

 removed was but 1 pound, thus showing no effect from removing tassels. In similar 

 266!^4— i^o. 12 2 



