Onion (Allium cepa L.). Boron toxicity results in burning of the tips of leaves, gradually increasing up to the base, and no development of bulb occurs (93).
Pea (Pisum sativum L.). Boron toxicity results in suppression of plant height and in the number of nodes (98). Unpublished data of Gupta and MacLeod (83) showed that boron toxicity results in burning of the edges of old leaves.
Potato (Solanum tuberosum L.). Boron toxicity symptoms include arching mid-rib and downward cupping of leaves and necrosis at leaf margins (85).
Strawberry (Fragaria x ananassa Duchesne). Slight boron toxicity was associated with marginal curling and interveinal bronzing and necrotic lesions. Under severe boron toxicity interveinal necrosis was severe, leaf margins became severely distorted and cracked, and overall plant growth was reduced (102).
Wheat (Triticum aestivum L.). Boron toxicity in wheat appears as light browning of older leaf tips converging into light greenish-blue spots (63). In durum wheat (Triticum durum Desf.), toxicity results in retarded growth, delayed heading, increase in aborted tillers, and suppressed grain yield per tiller (103).
Bajri (Pennisetum typhoideum). Boron toxicity results in the burning of leaf tips. On the basal leaves, small necrotic areas appear at the margins and proceed slowly toward the top of the plant (93).
Bean (Phaseolus vulgaris L.). Excess boron causes mottled and necrotic areas on the leaves, especially along the leaf margins (91). In faba bean (Vicia faba L.), symptoms first appeared as yellowing of the mature foliage, followed by a marginal necrosis and finally by the death of the whole plant (101).
Tobacco (Nicotiana tabacum L.). Boron toxicity results in brown circular spots on the periphery of the leaves, and stunted growth (93).
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