Submitted to: National Symposium - New Crops
Publication Type: Abstract Only
Publication Acceptance Date: November 23, 1995
Publication Date: N/A
Technical Abstract: As a result of inconsistent responses to supplemental nitrogen (N) fertilization and the general absence of kenaf (Hibiscus cannabinus L.) fertility recommendations, research was conducted at Lane, OK, to determine the effect of N application rates of 0 (control) 50, 100, 150 and 200 lb/acre on kenaf yield components. Kenaf cultivars 'Tainung 1' and 'Everglades 41' were planted in May of 1989 and 1990 on a Bernow fine sandy loam soil with a 0-3% slope. Nitrogen applications did not affect plant height, plant density, or stalk biomass percentage compared to the control. Stalk diameters at 40 in. increased with N application rates of 100, 150, and 200 lb/acre compared to the control. Though not significantly different, there was a trend of increased stalk yields up to 150 lb N/acre, while 200 lb N/acre significantly decreased stalk yields compared to 150 lb N/acre. This research demonstrated the importance of determining N requirements for specific production areas without assuming the need for high N applications to achieve maximum yields. It also demonstrated that excess N can have a detrimental effect on stalk yields.