COTTON IN WEEVIL-CONTROL EXPERIMENTS 



29 



Table 17. — Average row yields of cotton in all experiments conducted at San 



Antonio 



Kind of experiment 



Date 



planted, 



1923 



Treatment for weevils 



Plant spacing 



Average 

 yield 

 from a 



200-foot 

 row 



(pounds) 





May 12 

 [Apr. 19 



^Apr. 28 

 May 5 

 iMay 12 



Apr. 23 



...do 



Apr. 22 







11.18 



Separate late planting 



\2 plants in a hill. 



do — 





Square stripped, poi- 

 soned. 

 .. do 



10.33 

 11.82 





do 



8.81 







do 



8.98 





do 





3.25 







8.28 











do 



do 









5.8 



Cultural test No. 2, field C3.. 





6.5 







6.5 



test D3. 









SOIL, CLIMATIC, AND WEEVIL CONDITIONS AT CHARLESTON, S. C. 



A comparison of successive plantings of cotton was made in South 

 Carolina on the farm of F. P. Seabrook on James Island, about 10 

 miles southeast of Charleston. The soil where the cotton was 

 planted is light and sandy, well drained, and representative of the 

 lighter type of soil of the Sea Islands. It is technically described by 

 the Bureau of Soils as Norfolk fine sand. This type of soil normally 

 produces a comparatively small plant and is admirably suited for 

 cotton. 



The winters are mild, and the soil becomes warm early in the 

 spring. Cotton can usually be planted the last week in March 

 without danger of frost injury. The summer temperatures are 

 moderate. Rainfall is abundant and fairly well distributed, although 

 periods of dry weather are often experienced in the spring and early 

 summer, while periods of excessive rainfall are common in late July 

 and August. Records of maximum and minimum temperatures and 

 of the precipitation were obtained at James Island from March 14 to 

 October 15. These records are summarized in Table 18. 



Table 18. — Average maximum and minimum temperatures and monthly precipi~ 

 tation at James Island {near Charleston) , S. C, from March to October, 1923 



Items of comparison 



Mar. 



Apr. 



May 



June 



July 



Aug. 



Sept. 



Oct. 



Average temperatures (° F.): 



167.3 



i 51.5 



2.23 



72.2 

 54.6 

 1.82 



77.0 

 65.8 

 6.27 



85. 



87.2 



88.9 



85.4 



2 76. 9 









2.54 



9.36 



8.09 



3.13 



3.06 







' March 14 to 31 o 



iiy. 







2 Octobe 



r 1 to 15 



only. 







During the season of 1923 cold dry weather during April was 

 unfavorable to the growth of cotton in the seedling stage. With 

 wjirmer weather and more abundant moisture in May, growth became 

 more rapid, and conditions were favorable for setting a crop during 

 June and the early part of July. Excessive rainfall in the latter part 

 of .July and in August resulted in an abnormally high degree of boll 

 shedding. 



