The planted area of Vinh citrus cultiva in Luc Yen district in 2014 was 113.5 hectares, accounting for 28.79 percent of Citrus fruit total area. Cam Vinh grapefruit cultiva can grow well in the ecological conditions of Luc Yen, but the rate of fruit set was too low should not bring high economic efficiency for the gardener. Foliar fertilizing method increase fruit and grapefruit yield, which Kali-Bo and MD 201 for the highest efficiency rate of fruit reaching 6.11 percent and 6.34 percent, increasing yield from 40.16 to 41.26 percent compared to controls.