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Hawaii Pollination, Fertilization and Post-Fertilization Require - 

 ments of Passion Fruit and Other Plants of Comnfircial Potential 

 in Hawaii . To determine factors involved in pollination, fer- 

 tilization and post-fertilization of passion fruit and other 

 types of commercial potential, specifically to determine: (l) 

 extent of self- and cross -compatability; (2) factors responsi- 

 ble for self -sterility and differences in compatability; and, 

 (3) factors responsible for malformation of fruit. 

 Plant Physiol, 662 



P. R, Effect of Nutrient Applications on Coffee Yields in Puerto 

 Rico . To determine the minimum nutrient applications necessary 

 to maintain maximum yields of the most promising coffee 

 varieties in Puerto Rico, 



Hort,, Agron, 20 Coop. Federal Experiment Station, Mayaguez 



P. R, Vegetative Propagation of Coffee . To (l) develop tech- 

 niques whereby coffee plants can be easily and economically 

 Biultiplied by cuttings £ind grafts; (2) extend range of soils 

 and other environmental conditions xmder which coffee plants 

 can be grown successfully; and, (3) make possible improvement 

 of existing coffee seedling plantations by top-working old 

 and inferior coffee plants. 

 Coffee Substa, 2k 



P, R, Foliar Diagnosis for Pineapples . Learn relation between 



content of N, P, and K, or other essential elements in suitable 

 tissues of pineapples and the "relative yields", of the pine- 

 apple represented by said plant tissue saarples considering: 

 (l) what part of plant is most suitable for reflection of 

 nutrient deficiencies and yields; (2) when tissue samples must 

 be taken to show nutrient-yield relationship and be in time to 

 make adequate applications to crop to correct any deficiencies; 

 (3) influence played by external factors in modifying nutrient 

 content of plant, so corrections can be made to stabilize 

 nutrient-yield equations; (k) influence variety and soil play 

 in modifying nutrient content of plant, so adequate steps can 

 be taken to formulate different nutrient -yield equations; and, 

 (5) what mathematical equation best approximates relation be- 

 tween plant nutrient content and relative yields of said crop. 

 Agron., Hort. Il6 



P. R. Natural Coffee Shading . Learn trees best suited for grow- 

 ing coffee binder natural shade. 

 Plant Phi's iol, 122 



