STARCH CROPS I 43 



15) Seed ears averaging 88.16 per cent grain have given a 6-year 

 average >deld of 64.64 bushels of shelled corn per acre, as compared with 

 a yield of 65.06 bushels from ears averaging 76.38 per cent of grain. 



16) A comparison of kernels from the butt, middle and tip portions 

 of ears shows only 0.57 of a bushel difference in yield, as a 9-year average, 

 and no difference in matiuit}* or any important character. 



17) Seed ears having 14,16 and 18 rows of kernels have been com- 

 pared for 5 3'ears. The 14-rowed ears led sHghtly in >-ield at Wooster and 

 Germantown; the i6-rowed ears at Carpenter. 



18) While the height of plant and ear varies with the season, select- 

 ing for high and low ears within a variety has resulted in changing ver\- 

 materially the relative height of ear and also the time of maturity. Low 

 ears are associated wdth earliness. The comparative yield has not been 

 reduced by selection for low ears. 



19) Seed corn grown on rich, as compared with poor soil, and one 

 plant per hill, as compared with five, though larger and apparently of bet- 

 ter quahty, has not given any larger yield, on the average, than the smaller 

 ears grow^n under the poorer conditions. 



20) The principal causes of barren plants are variations in season, 

 in feVtility, and in time and rate of planting. Such variations in conditions 

 of growlh have increased the amount of barrenness 200 to 2 000 per cent. 



21) The cultivation in separate rows of grains from the same ear 

 (" ear-row " tests) and the subsequent crossing of the best ears in isolated 

 breeding plots show possibilities of increasing the yield of corn 5 to 10 bu- 

 shels per acre, but it seems dif&cult to go much be^'ond this amount. 



22) Of 13 first -generation crosses grown beside both parents, only 

 two exceeded in yield the better parent variety- by more than 2 bushels 

 per acre. 



23) A 4-year average gain of 3,9 bushels of shelled corn per acre 

 has resulted from the use of the individual ear germination test. At 2s 

 id (50 cents) per bushel for corn, this is a return of £ i 7s od ($6.50) per hour 

 for testing. 



24) Experiments in thinning corn show a 4-year average gain of 8.47 

 bushels per acre in the case of untested seed and 6.31 bushels for tested seed. 

 The average time required for thinning an acre of corn has been 5.7 hours. 

 25) As an average of 6 years' tests corn reached, its maximum shrin- 

 kage August 1st. Based on shrinkage alone 2s 7I4 d (62.47 cents) for 

 70 pounds of ear-corn on August 1st is equivalent to 2s id (50 cents) on No- 

 vember 1st. WTiile midseason and late varieties had 24.29 and 3104 per 

 cent of moisture, respectiveh^ on November ist, on August ist they 

 carried 10.08 and 10.69 respectively. 



1074 - Effect of Sulphur in the Cultivation of the Potato ; Experiments in Chili. — opazo st.^rch crops 



<".. R. in t.l A-iicultnr, Xo. kjv. pp. I2'j-iy). Santiatio de Chili, June, i'ii6. 



It has been shown that it is not enough to add sulphvu- to any or even,' 

 soil to obtain good results. As proof may be cited the opinion expressed 

 by Boullanger in his communication of July 1912 to the Paris Acadeni}' of 



