Effects of Soil-Applied and Trunk and Petiole-Injected Manganese on Manganese Content of Coconut Palm (Cocos nucifera)

Timothy K. Broschat; Joseph J. Doccola

doi:10.48044/jauf.2010.035

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Table 1.

Actual and changes in Mn concentrations (from month 0) in leaf 1 of coconut palms that were treated with manganese sulfate via soil application, petiole injection, or trunk injection. Means with different letters following are statistically different at the P = 0.05 level based on the Waller-Duncan k-ratio method. (n = 10)

Treatment	Actual Mn concentration (ppm)				Change in Mn concentration (ppm)
Treatment	Month 0	Month 1	Month 3	Month 6	Month 1	Month 3	Month 6
1: Control (no Mn)	118.5	116.4 b	89.8 b	69.6 b	2.1 b	−28.7 b	−48.9 b
2: Soil application	128.6	145.7 ab	97.5 b	73.4 b	17.2 b	−31.1 b	−53.2 b
3: Petiole injections (4)	143.1	145.9 ab	125.6 b	86.6 ab	2.8 b	−17.5 b	−56.5 b
4: Petiole injection (1)	112.6	110.5 b	84.9 b	63.6 b	−2.1 b	−27.7 b	−49.0 b
5: Trunk injection	89.8	191.8 a	203.2 a	113.3 a	101.9 a	113.4 a	23.5 a
P-value	0.088	0.0254	0.0002	0.033	<0.0001	<0.0001	<0.0001