If the papaya (Carica papaya) crop does not fructify, it means a heavy loss for the farmer who is banking on it. When he was faced with the problem of his papaya crop not flowering or bearing fruit, Maganbhai Sheladiya hit upon a good idea. He put a coconut shell and pressed it hard on the crown of the papaya tree. To his pleasant surprise a strange thing happened. Soon tender leaves, followed by flowers, started growing from the groove of the trunk. Maganbhai explains that by pressing down coconut shells in the groove of the papaya trunk, the plants vertical growth is retarded. As the plant develops laterally, there is no need for further leafing. Flowers followed by fruit are the result. This is exactly what a grower aspires for.
Ingredients: Coconut (Cocos nucifera) shells
"Excessive vegetativegrowth adversely affects fruit setting while excessive fruit load reduces development of treecanopy. Skillful orchard management at this stage includes maintenance of optimum number of bearing branches as per the nutritional status and health of plant. Young trees tends tohave more vegetative growth, therefore, it has been observed that sometimes fruit productionis suppressed by excessive vegetative flushing particularly during autumn. Therefore, effectivemeasures like ringing, girdling, fostering of winter shoots, use of paclobutrazol, etc. can beapplied for proportional crop production."
http://tmnehs.gov.in/writereaddata/Chap-8.pdf