28 



BULLETIN 981, IT. S. DEPARTMENT OF AGRICULTURE. 



In the Northern States, above 40° north latitude, the safest rule 

 is to withhold planting until the ground is thoroughly warm and the 

 weather settled. Not enough data were obtained from northern 

 stations to decide the question of the best date for planting. Un- 

 favorable weather conditions prevented seeding on the earlier dates 

 in most years. It is worth mentioning, however, that seedings on 

 June 1 have been uniformly successful at Redfield, S. Dak. 



Table III. — Yields of Sudan grass hay from different dates of seeding in various parts 



of the United States . 





Plats. 



Sea- 

 sons 

 under 

 test. 



Yields of cured hay (per acre) from plantings made on — 



Location of test. 



Size. 



Repli- 

 ca- 

 tions. 



Apr. 

 1. 



Apr. 



15. 



May 

 1. 



May 

 15. 



June 

 1. 



June 

 15. 



July 

 1. 



July 

 15. 



Southern section: 



A crcs. 

 0.05 

 .05 



2 

 2 



2 

 7 

 1 



1 

 5 

 1 



Tons. 

 3.82 

 2.07 

 4.70 



5.38 

 1.98 

 1.31 



Tons. 

 3.84 

 1.95 



3.85 



5. 5S 

 2.05 



1.81 



Tons. 

 4.15 

 1.97 



3.60 



3.60 

 2.11 

 1.54 



Tons. 

 3.80 

 2.05 

 3.15 



3.45 

 2.05 



2.04 



Tons. 

 3. 55 

 1.55 



3.00 



3.05 

 2.29 



Tons. 

 2.91 

 1.67 



Tons. 



Tons. 



Chillicothe, Tex... 

 Baton Rouge, La.. 



1.58 





Agricultural Col- 

 lege, Miss 



Athens, Ga 



.05 



1 



1 or 2 



2 



2.63 

 2.05 



2.58 

 1.32 



1 33 



Gainesville, Fla 



.05 















Average 









3.21 



3.18 



2.83 



2.76 



2.69 



2.32 



1.83 



1. 33 





.05 

 '.05 

 .05 

 .02 

 .10 

 .05 

 .02 









Middle section: 



Davis, Calif. 1 



2 

 2 

 2 

 2 

 1 

 2 

 1 



2 

 .2 



6 

 2 

 1 

 5 

 1 

 2 

 3 

 1 



5. 60 

 4. 90 



.65 



1.10 

 1.66 



6.80 

 7.02 

 .37 

 1.10 

 2.23 

 1.52 

 1.25 

 2.23 



4.87 

 4.70 

 1-51 

 2.06 

 2.94 

 1.68 

 . 1.05 

 2.28 

 3.52 

 2.17 



5.02 

 4.98 

 1.84 

 2.80 

 2.70 

 1.71 

 1.10 

 2.55 

 2.73 

 2.69 



3.98 

 3.20 

 1.84 

 3.76 

 .68 

 1.70 

 1.70 

 2.48 

 2.74 

 3.32 









Do 









Havs, Kans 



Tribune, Kans.... - 

 Stillwater, Okla... 



Amarillo,Tex 



Knox ville, Tenn. . . 



1.87 

 2.98 

 1.18 

 1.81 

 1.05 

 2.58 

 2.30 

 3.85 



1.61 

 2.40 

 .43 

 1.99 

 1.05 

 2.28 

 1.85 



1.30 

 1.27 

 .88 

 1.37 

 1.37 

 1.02 



Blacksburg, Va 



College Park, Md.. 



.05 

 .05 



2 

 2 









2.25 

















1.14 



1.45 



2.15 



2.27 



2.28 



2.20 



1.66 



1.35 













N orthern section: 



St. Paul, Minn 



.015 

 .05 



2 

 2 



1 

 5 







4.74 

 2.75 



4.54 

 2.87 



4.59 

 3.05 



4.49 

 2.77 







Redfield, S. Dak... 































3.75 



3.71 



3.82 



3.63 





















Irrigated. 



2 The data for Davis are excluded from the averages. 



The latest date at which it is advisable to sow Sudan grass may be 

 considered roughly as 70 to 90 days before the normal date of the 

 first killing frost in the fall. The high price of seed makes it advisable 

 to postpone seeding several weeks rather than sow in dry, cold, or 

 weedy soil. If conditions for planting continue bad during the 

 season, it may be found practicable to substitute for Sudan grass a 

 forage crop the seed of which is cheaper, such as sorghum or millet. 



METHOD OF SEEDING. 



The method of seeding found best for sweet-sorghum hay produc- 

 tion in any region should be followed in seeding Sudan grass. This 

 means that it may be sown broadcast, in close drills, or in any con- 



