Cucurbit crop nutrient sufficiency ranges

Cucurbit Crop Nutrient Sufficiency Ranges¹
Plant Part	Time of Sampling	N	P	K	Ca	Mg	S	Fe	Mn	Zn	B	Cu
Plant Part	Time of Sampling	Percent (%)						Parts per Million (ppm)
Cucumber
Most recently mature leaf	Before bloom	3.5-6	0.3-0.6	1.6-3	2-4	0.58-0.7	0.3-0.8	40-100	30-100	20-50	20-60	5-20
Most recently mature leaf	Early bloom	2.5-5	0.25-6	1.6-3	1.3-3.5	0.3-0.6	0.3-0.8	40-100	30-100	20-50	20-60	5-20
Muskmelon
Most recently mature leaf	30 cm (12 in.) vines	4-5	0.4-0.7	5-7	3-5	0.35-0.45	0.2-0.5	40-100	20-100	20-60	20-80	5-10
Most recently mature leaf	Early fruit set	3.5-4.5	0.25-0.4	1.8-4	1.8-5	0.3-0.4	0.2-0.5	40-100	20-100	20-60	20-80	5-10
Pumpkin
Most recently mature leaf	5 weeks after seedling	3-6	0.3-0.5	2.3-4	0.9-1.5	0.35-0.6	0.2-0.4	40-100	40-100	20-50	25-40	5-10
Most recently mature leaf	8 weeks from seeding	3-4	0.25-0.4	2-3	0.9-1.5	0.3-0.5	0.2-0.4	40-100	40-100	20-50	25-40	5-10
Squash
Most recently mature leaf	Early fruit	3-5	0.25-0.5	2-3	1-2	0.3-0.5	0.2-0.5	40-100	40-100	20-50	25-40	5-20
Watermelon
Most recently mature leaf	Last cultivation	3-4	0.25-0.5	3-4	1-2	0.25-0.5	0.2-0.4	30-100	20-100	20-40	20-40	5-10
	First flower	2.5-3.5	0.25-0.5	2.7-3.5	1-2	0.25-0.5	0.2-0.4
	First fruit	2-3	0.25-0.5	2.3-3.5	1-2	0.25-0.5	0.2-0.4
¹ The sufficiency ranges provided are to be used as a reference and a guideline only.
Adapted from Maynard, D.N., and G.J. Hochmuth. 2007. Knott’s Handbook for Vegetable Growers. 5^th edition. John Wiley & Sons, Inc. New York.