Reply to “Effect of Shading on the Growth of some Common Weeds of the Semi‐arid Tropics”

Shetty, Soumya; Sivakumar, M. V. K.

doi:10.2134/agronj1983.00021962007500060044x

Cited by 5 publications

(5 citation statements)

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“…However, the low diversity in the mango-HCS may be due to limited light availability to the undergrown weeds, thus suppressing the growth of some weeds like sedges (Cyperus spp.) (Shetty et al 1982) and ANAR (CABI 2021).…”

Section: Discussionmentioning

confidence: 99%

Soil weed seedbank under different cropping systems of middle Indo-Gangetic Plains

Sharma¹,

Singh²,

Verma³

et al. 2022

Plant Soil Environ.

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Trees on agricultural fields can have a positive or negative impact on weed seedbank (WSB) due to diverse environmental and soil characteristics. Therefore, soil samples were drawn in six cropping systems [two agroforest systems (AFS): guava, mango; three horticulture systems (HCS): guava, mango, Indian gooseberry; and annual crop system (ACS)] at two landscape positions (lowland and upland) and two soil depths (0–15 cm and 15–30 cm) using factorial randomised block design each replicated three times. Results showed that guava-AFS had the highest WSB of different categories in general and individual weed species in particular, except for Eragrostis pilosa and Dactyloctenium aegyptium. Simultaneously, guava-AFS also showed the maximum Shannon-Weaver, species richness and Simpson index and was low in Whittaker statistics (βW). The species evenness varied non-significantly with the cropping systems. Similarly, the landscape position had no discernible effect on any weed diversity indices; however lowland landscape position was dominated by Cyperus spp. and E. pilosa, while the upland by Phyllanthus niruri. Furthermore, with the exception of βW, the WSB and diversity indices were found to be higher on the topsoil (0–15 cm). Our study establishes that the AFS system in the semi-arid sub-tropics has a more diverse WSB indicating a healthy system, as opposed to HCS, which has a dominance of certain weed species, opening the door for more severe infestation of invasive weed species.

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Section: Discussionmentioning

confidence: 99%

Soil weed seedbank under different cropping systems of middle Indo-Gangetic Plains

Sharma¹,

Singh²,

Verma³

et al. 2022

Plant Soil Environ.

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“…This assertion is valid during the wet season, but as observed in the dry season in this study, P. phaseoloides was not very effective in suppressing C. odorata, probably due to its slow growth during the dry period (Tian et al 2001) which prevented a complete ground cover. Most grasses are susceptible to shading (Shetty et al 1982;Ng et al 1997) and therefore with the climbing habit of P. phaseoloides, the grasses were not able to survive, thus explaining their extremely low mass despite the varying climatic conditions. The inter-row spacing of 3 m between the hedgerows was an appropriate spacing usually employed in alley cropping (Kang 1993) but due to compact growth habit of F. macrophylla, a suitable micro-environment was created for the grasses through unhindered light penetration into the alleys.…”

Section: Discussionmentioning

confidence: 99%

Weed biomass dynamics in planted fallow systems in the humid forest zone of southern Cameroon

et al. 2007

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Interest in planted fallow systems has focused on soil fertility improvement, neglecting other potential benefits of such systems. It is important to quantify other processes responsible for crop yield increases under planted fallows, such as weed control. The suppressive potential on weeds of Flemingia macrophylla [(Willd.) Merrill] and Pueraria phaseoloides (Roxb.) Benth, planted fallows was evaluated in field trials in three villages in southern Cameroon. In each village, experiments were set up in 4-5 year-old bush fallow dominated by Chromolaena odorata (L.) R. M. King & H. Rob. and 20 year-old secondary forest. Total aboveground biomass production of P. phaseoloides was 7.45 Mg ha À1 , 4.2 times higher than F. macrophylla (1.78 Mg ha À1 ; P < 0.05). The high biomass of P. phaseoloides resulted in a significantly greater reduction in total weed biomass compared to Flemingia macrophylla in both wet and dry seasons. In the wet season (11 and 18 MAP), there were significant fallow system · land use and fallow system · village interactions for total weeds and broadleaf weeds. P. phaseoloides in bush (0.55 Mg ha À1 ), and P. phaseoloides at Ngoumou (0.09 Mg ha À1 ) had the lowest total weeds in the wet seasons. After the dry season, the lowest total weed mass was consistently recorded in P. phaseoloides while the highest was in the natural regrowth. The population of grasses was always higher in the F. macrophylla system than in P. phaseoloides system throughout the wet and dry seasons. Grass biomass in the P. phaseoloides-forest LUS was the least (0.01 Mg ha À1 ), 58 times lower than in F. macrophylla-bush (0.58 Mg ha À1 ). Biomass production of P. phaseoloides was highly significantly correlated with total weed biomass (r = À0.64; P = 0.004) while no relationship was found between biomass production of F. macrophylla and total weed biomass (r = À0.08, P = 0.747). It was concluded that P. phaseoloides was a suitable leguminous species for weed control. But for F. macrophylla, its low biomass production coupled with a compact plant architecture compromised it as an appropriate species for weed control in a planted fallow system.

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“…This may be due to the efficiency of weed control and the effect of maize shading. Shetty et al (1982) noticed that dicotyledonous are less shadesensitive than monocotyledonous.…”

Section: Effect On Number Fresh and Dry Weights Of Weedmentioning

confidence: 99%

Study the Critical Period of Weed Competition in Maize

El-Din

2003

Journal of Plant Production

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Two field experiments were carried out at the Experimental Farm of the National Research Centre, at Shalakan, Kalubia Governorate, Egypt, to determine the critical period of weed competition in maize fields during 2000 and 2001 in summer seasons. The main results could be summarized as follows:-The first 12-24 days after sowing (DAS) were the most critical period for weed removal in maize fields.-Weed removal at 12, 24 and 36 DAS decreased the number of total

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Reply to “Effect of Shading on the Growth of some Common Weeds of the Semi‐arid Tropics”

Cited by 5 publications

References 0 publications

Soil weed seedbank under different cropping systems of middle Indo-Gangetic Plains

Soil weed seedbank under different cropping systems of middle Indo-Gangetic Plains

Weed biomass dynamics in planted fallow systems in the humid forest zone of southern Cameroon

Study the Critical Period of Weed Competition in Maize

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