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- W238000890 abstract "Chickpea (Cicer arietinum L.) grown on residual soil moisture after the rice harvest is a promising crop for the High Barind Tract (HBT) of Bangladesh, an uplifted, slightly undulating area in northwestern Bangladesh where the soils have an acid surface horizon (pH 4.5-5.5 at 0–10 cm) but are neutral to alkaline with depth (pH >6 below 20 cm). Major constraints to chickpea cultivation are initial and terminal drought stress, pod borer (Helicoverpa armigera), and nutrient deficiency. Application of phosphorous (P) fertiliser can increase chickpea yields, but even when this is done symptoms of reddening, yellowing, and necrosis of older leaves are widespread across the HBT. Nodulation is generally sparse but responses to Rhizobium inoculation have been inconsistent. To determine which elements could be limiting to chickpea, a small-plot field experiment was conducted in the southern HBT in the 2001/02 season. A subtractive design was used in which the absence of either sulphur (S), boron (B), zinc (Zn), or molybdenum (Mo) was compared to a complete nutrient control. Only Mo was found to be limiting, giving a grain yield response of 73%. In 2002/03, multilocational trials in farmers’ fields were conducted to test the effect of soil application with 500g Mo ha and Rhizobium inoculation. Despite frequent rain during the reproductive phase, causing unprecedented infestation by Botrytis grey mould and exacerbating damage by pod borer, grain yield responses to Mo application alone were 173% in the northern HBT, 61% in the central-north HBT, and 58% in the southern HBT. There was a further slight, non-significant response to Rhizobium inoculation. There are no compound fertilisers containing Mo available in Bangladesh, and it is impractical to broadcast the small amount of Mo required evenly (<500g Mo ha). Previous studies indicated that sufficient Mo and Rhizobium could be added via seed priming – soaking the seed in water overnight prior to sowing. In the 2003/04 season, the effect of adding Mo alone or Mo with Rhizobium via seed priming was compared with surface application of Mo in multilocational trials in farmers’ fields. Adding Mo alone to the priming water did not significantly improve yield over the control, but there were significant responses to adding both Mo and Rhizobium in priming, of the same order as the response obtained when Mo was applied directly to the soil. The response of chickpea to Mo, applied either through priming or broadcast on the soil surface, and with inoculation of Rhizobium through priming, was evaluated in on-farm trials conducted on rice-fallow lands with acid soils in eastern India in 2003/04. In 29 trials with chickpea cv. ICCV 2, the mean yield increase" @default.
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- W238000890 date "2005-01-01" @default.
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- W238000890 title "Molybdenum response of chickpea in the High Barind Tract (HBT) of Bangladesh and in Eastern India." @default.
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