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Prognosis and diagnosis of boron deficiency in blackgram (Vigna mungo L. Hepper) in the field by using plant analysis

Noppakoonwong, R.N., Rerkasem, B., Bell, R.W.ORCID: 0000-0002-7756-3755, Dell, B. and Loneragan, J.F. (1997) Prognosis and diagnosis of boron deficiency in blackgram (Vigna mungo L. Hepper) in the field by using plant analysis. In: Bell, R.W. and Rerkasem, B., (eds.) Boron in soils and plants : proceedings of the International Symposium on Boron in Soils and Plants held at Chiang Mai, Thailand, 7-11 September 1997. Kluwer Academic Publishers, Dordrecht, The Netherlands, pp. 89-93.

Abstract

From previous glasshouse experiments, 12-18 mg B kg-1 dry wt in the youngest fully expanded leaf blade (YFEL) represents the minimum leaf boron (B) requirement for unrestricted leaf blade elongation (LBE) in black gram (Vigna mungo). A field experiment at Chiang Mai, Thailand was undertaken to test the validity of this B concentration range for diagnosis of B deficiency and to examine the possibility of using B concentration in the YFEL during growth for prognosis of seed yield at maturity. Six levels of B fertilizer (0, 0.5, 1, 2, 4 and 8 kg borax ha-1) and basal fertilizers were applied to 6 replicates. The critical B concentration for diagnosis of pod number in the YFEL at the first mature pod was 13-17 mg B kg- I dry wt being within the range established from the glasshouse experiments. Thus, the functional B requirement for LBE, 12-18 mg B kg-I dry wt in the YFEL, can be recommended for diagnosis of B deficiency in black gram. The critical B ranges in the YFEL for prognosis of seed yield were 31 ± 3, 30 ± 4, 15 ± 1, and 9 ± 1 mg B kg-1 dry wt at the first inflorescence, first pod, first full pod and first mature pod, respectively. The unusually low value of 9 ± 1 mg B kg-1 dry wt is attributed to the recovery of B deficient plants as the result of an increase in B uptake following rain after a drought period. Thus, the use of prognostic values of B deficiency can be limited by the probability of rain after sampling. Despite this limitation, critical values for the prognosis of B deficiency can be used as a guide to the possibility of B deficiency depressing final yield.

Item Type: Book Chapter
Murdoch Affiliation: School of Biological and Environmental Sciences
Publisher: Kluwer Academic Publishers
Copyright: © Kluwer Academic Publishers
Publishers Website: http://www.springer.com/life+sciences/plant+scienc...
URI: http://researchrepository.murdoch.edu.au/id/eprint/13015
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