PHOSPHATE (P) SOURCES AND IRRIGATION SUPPLY INFLUENCE YIELD AND TRANSPIRATION WATER USE EFFICIENCY IN GRAIN AMARANTH (AMARANTHUS CRUENTUS L.)

O.D. Ojo
Studies have shown low soil P and water availability as major constraints to grain amaranth (Amaranthus cruentus L.) production in sub-Sahara Africa (SSA). Effects of phosphate sources (single super phosphate-SSP; Sokoto rock phosphate-SRP; Ogun rock phosphate-ORP) and water supply were therefore determined on yield and transpiration water-use efficiency (WUET) of dual purpose (vegetable + seed) grain amaranth in pots in a glasshouse at Ibadan (7°54’N; 7°30’E, 213 m above sea level), Nigeria. Phosphate sources and water supply had significant effects on yield and WUET. Compared with the control plants, which had adequate water and P available to them, yield was reduced by 32% with low water supply and by 46% with low P supply. Under adequate P-supply, water stress increased WUET by 56%. Under adequate water supply WUET did not differ significantly between P-sources but was in the order SSP>SRP>ORP. These indicate the potentials of using rock phosphate as alternative phosphate source and efficient water use in SSA irrigation systems.
Ojo, O.D. (2013). PHOSPHATE (P) SOURCES AND IRRIGATION SUPPLY INFLUENCE YIELD AND TRANSPIRATION WATER USE EFFICIENCY IN GRAIN AMARANTH (AMARANTHUS CRUENTUS L.). Acta Hortic. 1007, 291-293
DOI: 10.17660/ActaHortic.2013.1007.31
https://doi.org/10.17660/ActaHortic.2013.1007.31
Amaranthus, phosphorus, water use efficiency, yield, irrigation, tropics
English

Acta Horticulturae