Rhubarb

Table XX. Rhubarb Nitrogen Recommendations
Application Time	Actual N kg/ha
Field-Grown
Preplanting	100
Annually
Early spring	100
After harvest	100
Total	200
Crowns for Forcing
Early spring	100
July¹	180
Total	280
¹ As much as 100 kg N/ha of the nitrogen recommendations may be applied through the fertigation system after harvest or in July.

Test the soil to determine phosphorus and potassium requirements.

Table X, Phosphorus and Potassium Requirements for Rhubarb on Mineral Soils
Legend: HR = High Response MR = Medium Response LR = Low Response RR = Rare Response NR = No Response
Phosphorus			Potassium
Sodium Bicarbonate Phosphorus Soil Test (ppm)	Rating	Phosphate (P205) Required kg/ha	Ammonium Acetate Potassium Soil Test (ppm)	Rating	Potash (K2O) Required (kg/ha)
0-3	HR	230	0-15	HR	340
4-5	HR	230	16-30	HR	330
6-7	HR	220	31-45	HR	310
8-9	HR	220	46-60	HR	180
10-12	HR	220	61-80	HR	250
13-15	HR	210	81-100	HR	200
16-20	HR	190	101-120	MR	150
21-25	MR	160	121-150	MR	90
26-30	MR	140	151-180	MR	50
31-40	MR	110	181-210	LR	0
41-50	MR	80	211-250	RR	0
51-60	LR	50	>250	NR	0
61-80	RR	0
80+	NR	0