4.3 Article

INCREASING SAR OF IRRIGATION WATER AGGRAVATES BORON TOXICITY IN MAIZE (ZEA MAYS L.)

Journal

JOURNAL OF PLANT NUTRITION
Volume 33, Issue 9, Pages 1301-1306

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2010.484091

Keywords

boron toxicity; calcium deficiency; brackish water; maize cultivars; SAR

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We evaluated the effect of boron (B) application on shoot growth and shoot B concentration and uptake by two maize cultivars ('FHY-396' and 'Sonari') on a loam soil irrigated with water of different sodium absorption ratio (SAR) values [control, 5 and 15 (mmolc L-1)1/2]. Plants were harvested after forty days of growth. Shoot dry matter decreased significantly (P 0.05) with B application due to toxicity marked by leaf injury. Toxic effect of B was further aggravated by increasing SAR of irrigation water. In both cultivars concentration and uptake of B was significantly (P 0.05) increased over control with B application and SAR of irrigation water. Shoot Ca concentration decreased with increasing SAR and B application. The phenomena of B toxicity and low Ca marked by reduction in shoot dry matter of plants irrigated with high SAR water could be important in management of brackish water used for irrigating crops on arid and semiarid region soils.

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