Allelopathic Effects of Winter Legumes on Germination and Seedling Indicators of Various Summer Cereals

Abstract

In the present study, the putative allelopathic potential of aqueous extracts (10 % w/v) of three legumes, i.e. alfalfa, berseem and brassica spp., including distilled water treatments as check were evaluated on germination and early seedling growth indicators of rice, sorghum and millet under laboratory conditions. The treatments were compared in completely randomized design with factorial arrangements in four replications. The recorded observations clearly indicated that the germination process and seedling growth of receptor plants were negatively affected in the presence of legume extracts. The extract of Brassica had the strongtest inhibitory effect on germination process in form of increased mean germination time (MGT) and lowered the coefficient of velocity of germination (CVG), germination % age and germination index (GI) as compared to other extracts. Likewise, the lowest root and shoot length, their fresh and dry weight was also noted in petri dishes with Brassica extracts. Among the receptor crops, rice was the most susceptible in term of both seedling growth and germination attributes. The interaction between test crops and legume extracts was found to be significant for most of studied parameters except germination % age, fresh and dry weight of root and shoot. The presence of allelochemicals in the studied legumes entitled them to be used in weed management programme and is also signal for designing specific production technologies able to reduce their effects on succeeding crops.

Allelopathy of Faba Bean Cover Crop to Durum Wheat Under a Semi-Arid Environment

“…Leaf-extracts were, invariably, the most inhibitory plant component, independent of the growing season and phenological stages. Leaf extracts of cluster bean (Cyamopsis tetragonoloba L.) and mung bean (Vigna radiata L.) were also the most allelopathic plant component (Ayub et al 2013). For milk peas (Galactica pendula Pers.…”

Allelopathic Effect of Selected Rice (Oryza sativa) Varieties against Barnyard Grass (Echinochloa cruss-gulli)

“…Rice’s allelopathy has been thoroughly examined, and a wide variety of rice types have been proven to hamper the development of various plant species during co-cultivation [ 19 ]. When looking at the behaviour of target crops, it has been observed that rice root and shoot growth are the most sensitive to the stress imposed by allelochemicals [ 20 ]. Extracts from the jungle rice shoot have shown a greater inhibitory effect on root length and seedling dry weight, according to Sitthinoi [ 21 ].…”

Effect of Legume Extracts on Germination, Seedling Health of Beans (Phaseolus vulgaris L.) and Soil Microorganisms

“…The toxic chemicals released into the soil during breakdown of the residues may cause severe inhibition to germination, however, the concentrations phytotoxins decline as decomposition proceeds [3,6]. The chemicals released alter the plant environment which may result in either poor crop germination or reduced growth [7] and the seeds allowed to germinate in such environments require more time for germination [8]. Lertmongkol et al [9] reported that continuous cropping of mung bean led to plant growth inhibition by between 10 to 25% of successive crop growth.…”