FIELD CROPS. 



233 



vetch, artichokes, and potatoes are given with a brief discussion of the adapt- 

 ability of each to the rejrion and its cultural requirements. 



[Rice and cotton investigations], W. P. Kelley and F. G. Krauss (Hawaii 

 Hta. h'i)t. J90!). PI). 63-76, pis. -'/). — A progress report is given of work with rice 

 and cotton and some data on the cotton work presented. 



The rice yield during 1909 was greatly injured by the unprecedented attack 

 of a destructive army worm (Lcucania unipuncta). Rice No. 19, S. I'. I. 12508, 

 is believed to be firmly established and is being planted by growers. 



Propagation of cottons by cuttings and budding was undertaken, and also 

 experiments in pruning plants^^ring their second season of growth. Sea 

 Island types were found to resi)ond best to low pruning in which a mere stump, 

 3 to in. in length, is left. The Caravonica types do best when from one-fourth 

 to three-fourths of the previous season's growth is removed. Too severe prun- 

 ing causes excessive woody growth in these types at the expense of the fruit. 

 Such rank growth is brittle and liable to splinter in heavy winds. Low pruning 

 of upland cottons insures the survival of a larger percentage of plants until the 

 next season, but when pruning to spurs after the fashion of California grape 

 growers was resorted to the fewer plants which did survive outyielded those 

 which were pruned later. 



It has been found possible to obtain 100 or more cuttings from a single 

 Caravonica plant. Shield budding has proved effective and practicable in field 

 culture. Brief notes are given on a number of Sea Island. Egyptian, Ui)laud, 

 and Caravonica varieties which are being tested, on 2 wild native Gossypiums 

 (G. tomcntosum and G. (Irynarioides), which are being propagated for use as a 

 basis for breeding work, and on Chinese and Japanese matting sedges {Cy perns 

 tcget-formis and Juncus effusus). 



Report of an experiment on the manuring of rye grass and clover at 

 several centers in the county during 1906—7, E. Porter and R. C. Gaut 

 (Comity CoiDH-il Lanf-asicr, Ed. Com., Ayr. Dcpt.. Fanner's Bui. 15. pp. 23). — 

 The results of the miiform manurinl plat experiments at 11 different centers in 

 1906-7 are summarized in the following table: 



Results of tests icitJi fertilisers on ryeyrass and elorer. 



Plat 

 No. 



Fertilizer. 



Cost of fer- 

 tilizer. 



o Average 

 profit on 

 first crop. 



6 Average 



profit on 



aftermath 



at 2 centers 



in 1907. 



Nitrate of soda, 1 cwt 



Nitrate of soda, Icwt.; superphosphate, 2 cwt 



Nitrate of soda, 1 cwt.; superphosphate, 2 cwt.; muriate 

 of potash, 1 cwt 



Superphosphate, 2 cwt.; muriate of potash, Icwt 



Nitrate of soda, 1 cwt.; basic slag, 2 cwt.; muriate of pot- 

 ash, Icwt 



Sulphate of ammonia, 88 lbs.; superphosphate, 2 cwt.; 

 muriate of potash, 1 cwt 



Nitrate of soda, 2 cwt.; superphosphate, 2 cwt 



£ s. d. 

 9 10 

 15 1 



4 2 

 4 11 



s. d. 

 6 10 



16 3 



13 



" Valued at 2.s. per -cwt. 



" Valued at 



per cwt. 



On plat 2 the nitrate of soda stimulated the rye grass without injuring the 

 clovers, and the crop was bulkier and taller than that on the check plat. 

 IMat 3 was unsurpassed at 4 of the centers and usually showed more satisfac- 

 tory results than plat 2. Plat 4 was usually an improvement upon plat 3, and 

 had a full growth of good length in both clovers and rye grass. Plat 5 had, 

 at every center, the best clover growth but the rye grass was usually no stronger 

 than on the check plat. Plat 7 was deficient in the number of clover plants 



