EFFECT OF THE FORM OF THE AVAILABLE NITROGEN ON THE CALCIUM DEFICIENCY SYMPTOMS IN THE BEAN PLANT

Open Access
Publisher Website
Google Scholar
Abstract
With Ca present NO3 N produced better growth of Dwarf Red Kidney bean (Phaseolus vulgaris) than urea; in the absence of Ca much better growth was made with urea than with NO3. With urea the Ca deficiency symptoms were much delayed, and when they became evident they were much less severe. The Ca-deficient urea plants produced approx. 60% more growth than the Ca-deficient NO3 plants and all of them flowered. 25% of the Ca-deficient urea plants produced fruit; none of the Ca-deficient NO3 plants produced fruit, and only a few flowered. The roots of the Ca-deficient urea plants did not exhibit the usual Ca-deficiency symptoms, and they produced twice as much growth as those of the Ca-deficient NO3 plants.
Keywords