Study on the competitive effects between chickpea (Cicer arietinum L.) and redroot pigweed (Amaranthus retroflexus L.)under saline stress
1992
Vecchio, V. | Casini, P. (Florence Univ. (Italy). Dipartimento di Agronomia e Produzioni Erbacee)
This research has examined the effects of saline solution (NACl, MgSo4 and CaCl2) at ECe increasing levels on germination and on competition between chickpea (Cicer Arietinum L.) and redroot pigweed (Amaranthus retroflexus L.). ECe levels were 0.5 (control), 2.0, 4.0 and 6.0 mS cm -1. To value competitive effects between the two species (C = Chickpea, R = Redroot pigweed), infestation levels (LI) were setup according to additive (AD) and replacement designs (RD) in which the numbers refer to the plants per pot: AD = C4 + RO, C4 + R4 and C4 + R8; RD = C8 + RO, C4 + R4 and CO + R8. The increasing ECe did not cause any significative decrease on the germinability nor on the length of root and epicotyl of chickpea (ILC 482). ECe of 6.0 mS cm -1 reduced pigweed germination by 10% compared to control (26%). Both competition designs showed that the ECe of 4.0 and 6.0 mS cm-1 significantly decrease the plant height and minimize the loss of leaf number of chickpea. Increase in ECe causes negative effects on productive components of chickpea (number and seed weight per plant, pods per plant) more than IL. Plant height and leaf number of redroot pigweed in competition with chickpea, increase with the ECe increment. Rd showed that the chickpea has a low competitive ability when the ECe of 0.5 and 4.0 mS cm-1 areused. The presence of weed reduced ECe of gravitational water; consequently, amaranthus can be considered as a "bio-desalter". With the increase of ECe levels, total N content gets higher in both species. This fact could be a valid indicator to value saline stress of redroot and chickpea
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