138 



EXPERIMENT STATION RECORD. 



briefly discussed aud the plans, objects, and methods of the experiments reported 

 are noted. 



Of more than 100 varieties under test 11 have been selected as suitable for 

 Hawaiian conditions. A number of these are upland rices producing a fair 

 yield with a minimum moisture supply, and the others are promising wet land 

 rices of the short, thick kernel type characteristic of Japan rice. Brief notes 

 on some of these varieties are given. The results of a comparative study made 

 between plats of several varieties are presented in the following table : 



Comparison of standard Hatcaiian Gold Seed, Japan Seed, and Egyptian varie- 

 ties of rice. 



Name of variety. 



Standard Hawaiian Gold Seed. 

 Hawaiian-grown Japan Seed. . 

 Hawaiian-grown Egyptian 



Sta- 

 tion 

 inven- 

 tory 

 num- 

 ber. 



148 

 153 

 65 



Date of 



sowing, 



1907. 



Feb. 18 

 ..do.... 

 ..do.... 



Date of 



maturity 



and 



harvest, 

 1907. 



July 20 

 June 8 

 July 20 



Esti- 

 mated 



acre 

 yields, 

 paddy. 



Lbs. 

 3,730 

 3,412 

 4,129 



It v/as found in this work that some varieties which yield well from July 

 planting fail if sown in the early spring, or continue to vegetate until late fall, 

 when they flower and fruit at about the same time as summer plantings. The 

 all-season varieties are considered best for Hawaii. The spring varieties also 

 produce fall crops, while fall varieties are not at all suited to spring culture. 



With a view to discovering some of the fertilizer requirements of rice a 

 series of 7 fertilizer experiments was begun July 1, 1906, and continued through 

 a period of about 15 montlis. The first experiment was made with Hawaiian 

 Gold Seed, and the results secured are summarized in the following table: 



Su7nmary of pot experiments with rice, showing effect of fertilizers on grotcth. 



Se- 

 ries 

 No. 



Fertilizer used and calculated rate per acre. 



Water 

 transpired 

 by 5 plants 



in total 

 period of 



growth. 



Check ( no fertilizer) 



Stable manure 5 tons.. 



Lime, air-slaked 1 ton.. 



Nitrate of soda 200 lbs. . 



Sulphate of potash 200 lbs.. 



Acid phosphate 200 lbs. . 



Nitrate of soda and sulphate of potash, 200 



lbs. each 



Nitrate of soda and acid phosphate, 200 lbs. 



each 



Sulphate of potash and acid phosphate, 200 



lbs. each 



Nitrate of soda, sulphate of potash, and acid 



phosphate 200 lbs. each.. 



Nitrate of soda, sulphate of potash, and acid 



phosphate, 200 lbs. each, and lime, 2.000 lbs. 

 Nitrate of soda, applied in 10 doses, 3 days 



apart 200 lbs. . 



Gms. 

 202. 

 287.4 

 296.3 

 276.1 

 298.1 

 276.7 



299.7 



235. 1 



Green 

 weight of 

 5 plants 

 at end of 

 30-day 

 period. 



Gms. 

 1.92 

 2.75 

 2.75 

 2.57 

 2.75 

 2.57 



2.47 



2.67 



2.37 



2.67 



2.50 



4.40 



Water-free 



weight of 



5 plants 



at end of 



30-day 



period. 



Gms. 

 0.42 

 .60 

 ..57 

 .57 

 ..57 

 .57 



.60 



.57 



.50 



.60 



.55 



Water 

 transpired 

 per pound 

 of water- 

 free sub- 

 stance. 



Lbs. 

 480. 95 

 479.00 

 .519.82 

 484.38 

 522. 98 

 485. 44 



499. .50 



513. .S6 



450. .50 



524.33 



496. 91 



442.10 



The most striking result was the superior growth obtained where nitrate of 

 soda was supplied in 10 equal doses, and the second important result was the 

 apparent depreciation of the yield through the application of lime. 



