Controlled root targeted delivery of fertilizer using an ionically crosslinked carboxymethyl cellulose hydrogel matrix

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Table 1 Synthesis conditions of root targeted delivery vehicles (RTDV)

Sample	Fertilizer loading (% of full dose)	Fertilizer loading (wt%)	Drying (hours)
RTDV 1 ^a	22	20	0
RTDV 2 ^a	33	30	0
RTDV 3 ^a	44	40	0
RTDV 4 ^a	22	20	24
RTDV 5 ^a	22	20	48
RTDV 6 ^a	100	92	0
RTDV 7 ^a	100	92	24
RTDV 8 ^a	100	92	48
RTDV 9 ^a	44	40	24
RTDV 10 ^b	44	40	0
RTDV 11 ^c	44	40	0

^a refers to devices synthesized with the method detailed in RTDV synthesis above, ^b refers to devices synthesized while heating the crosslinking solution to 40°C as detailed in alternative RTDV synthesis methods below, ^c refers to devices synthesized using elevated levels of iron salts as detailed in alternative RTDV synthesis methods.