Abstract
ABSTRACTGreenhouse production of ornamental kale is popular for fall sales. The objective of this study was to evaluate if nondestructive handheld sensors could be used to quantify nitrogen (N) status in Brassica oleracea ‘Nagoya Red’. Topdressed fertilizer treatments of 0, 2.5, 5, 10, 15, and 20 g of 16-9-12 controlled release fertilizer (CRF) were utilized. Individual plants were scanned from 10 pots per treatment for Normalized Difference Vegetative Index (NDVI) values using a prototype NDVI pocket sensor, the recently released commercial GreenSeeker™ handheld, and a Soil-Plant Analyses Development (SPAD) chlorophyll meter at three different rating dates starting 25 d after fertilizer treatment application (DAT). Linear and quadratic trends were observed within sampling dates. All three sensors showed correlations with leaf N depending on sampling time. Results indicated that 10 g CRF would be recommended for potted production.
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