- 70 - 



Hawaii The Effect of Cult\iral Practices on the Grovth and Fruit - 

 ing of Papaya vith Special Emphasis on the Maintenance of 

 Production Under Continuous Cropping . To (1) learn if papayas 

 can be grown on soil continuously or with short intercycles 

 if there are suitable soil amendments, f\miigation treatments, 

 green manuring and mulching or combinations thereof; and, (2) 

 investigate the fruit yield and quality of trees rehabilitated 

 by dehorning and by side dressing with soil decontaminates. 

 Hort. 17^.3 



Hawaii Pnming axid Training of Guava (Psidium Guajava) to Obtain 

 Maximum Yield and Quality of Fruit . To (1) establish several 

 systems of training such as open head, modified leader, and 

 center leader, and learn advantages or disadvantages of each 

 from standpoint of strength of tree and early bearing; (2) 

 learn effects of several types of pinning such as heading 

 back and thinning out on set and size of fruit, quality, and 

 yield; (3) learn season and rate of application of fertilizers 

 with respect to growth and yield in combination with pruning 

 practices; and, {k) learn if wild guava stands can be thinned 

 and renovated to produce commercial crops, 

 Hort. 179 



Hawaii To Isolate and Test Dwarfing or Semi -Dwarf ing Rootstocks 

 for Mango . To (1) select varieties of seedlings possessing 

 dwarfing or semi -dwarf ing qualities for possible vises as root- 

 stocks; (2) select varieties or seedlings possessing vigor and 

 hardiness; (3) compare vigor and dwarfing effects of such stocks 

 on own roots and when grafted upon other rootstocks; and, (k) 

 compare growth and fruiting of such treatments. 

 Hort. 182.1 



Hawaii A Physiological Study of Floral Initiation, Fruit Setting , 

 and Fruit Maturation of Certain Subtropical Plants, with Special 

 Reference to Growth Regulators, Fhotoperiod and Temperature . 

 Learn (1) effects of growth regulators on formation of lychee 

 fruits with aborted seeds and on preharvest drop of fruits; 

 (2) influences of growth regulators on passion fruit develop- 

 ment and preharvest drop; (3) physiological factors responsible 

 for star-flower formation in coffee; and, (k) factors respon- 

 sible for floral initiation in lychee and coffee: studies on 

 critical photoperiod and influence of tenrperature primarily. 

 Plant Physiol. 655.1 



Hawaii Nutritional Requirements of Coffee Growing on Lava Rock - 

 land Soil . Learn (1) phosphate requirements of coffee grown in 

 rock-land areas; (2) if there are any minor element requirements 

 for high yields in rock-land areas; and, (3) Importance of fre- 

 quency of fertilizer applications, timing, and kind of carriers 

 In promoting high yield in rock-land areas. 

 Plant Physiol. 659. 1 



