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. 2017 Nov 21;8:1953. doi: 10.3389/fpls.2017.01953

Table 2.

Fertilization guidelines on yam (Dioscorea spp.) from different regions.

Country		Target species	Target yield	Water-soluble fertilizer				Lime	Manure	Timing of NPK addition	Other
				N	P	K	Mg
			t FM ha⁻¹	kg ha⁻¹ year⁻¹				t ha⁻¹ year⁻¹
India	Kerala^a			80	60	80
	Tamil Nadu^b	D. alata and	20–25 t ha⁻¹	40	60	120			25	Before planting
		D. esculenta									At 30 days after planting: 4 kg ha⁻¹ Azospirillum
				50		120				90 days after planting
Nigeria^c	Low fertility class soil	D. alata and	Between 5 and 50 t ha⁻¹	90	54	75	6	0.5		56 days after planting	Apply in each case NPK in ring 15 cm from base of
	Medium fertility class soil	D. esculenta		45	25	40	6	If soil acidic		56 days after planting	the vine, 3-5 cm deep;
	High fertility class soil			20	0	0	6			56 days after planting	Apply Mg as basal fertilization
Sri Lanka^d		D. alata		30	30	29		1–2	10	Before planting	Incorporate basal NPK into soil before planting
				30		29		If soil acidic		60 days after planting	Subsequent applications to be done in a circle
				30		29				90 days after planting	around the plant and incorporated into soil
French	Martinique	D. alata,	Between 15 and 30 t ha⁻¹	41	45	113		1–3	20	Before planting
West		D. cayenensis,		69				If soil acidic		45 days after planting
Indies^e		and D. trifida		20		58				90 days after planting

^a

http://www.keralaagriculture.gov.in/htmle/crops/fertiliserrec.htm;

^b

http://agritech.tnau.ac.in/horticulture/horti_vegetables_Dioscorea.html;

^c

Chude et al. (2011);

^d

Department of Agriculture (2007);

^e

http://www.martinique.chambagri.fr/fileadmin/documents/CDA_martinique/internet/listes_frontend/SDQ/Fiches_techniques/FIT-Igname14.pdf.