On-farm assessment of cassava root yield response to tillage, plant density, weed control and fertilizer application in southwestern Nigeria

AbstractSugarbeet growers only recently have combined ethofumesate, S-metolachlor, and dimethenamid-P in a weed control system for waterhemp control. Sugarbeet plant density, visible stature reduction, root yield, percent sucrose content, and recoverable sucrose were measured in field experiments at five environments between 2014 and 2016. Sugarbeet stand density and stature reduction occurred in some but not all environments. Stand density was reduced with PRE application of S-metolachlor at 1.60 kg ai ha–1 and S-metolachlor at 0.80 kg ha–1 + ethofumesate at 1.68 kg ai ha–1 alone or followed by POST applications of dimethenamid-P at 0.95 kg ai ha–1. Sugarbeet visible stature was reduced when dimethenamid-P followed PRE treatments. Stature reduction was greatest with ethofumesate at 1.68 or 4.37 kg ha–1 PRE and S-metolachlor at 0.80 kg ha–1 + ethofumesate at 1.68 kg ha–1 PRE followed by dimethenamid-P at 0.95 kg ha–1 POST. Stature reduction ranged from 0 to 32% 10 d after treatment (DAT), but sugarbeet recovered quickly and visible injury was negligible 23 DAT. Although root yield and recoverable sucrose were similar across herbicide treatments and environments, we caution against the use of S-metolachlor at 0.80 kg ha–1 + ethofumesate at 1.68 kg ai ha–1 PRE followed by dimethenamid-P at 0.95 kg ha–1 in sugarbeet.

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On-farm Assessment of Improved Crop Production Practices in Northwest Syria. II. Lentil

Experimental Agriculture ◽

10.1017/s0014479700019621 ◽

1992 ◽

Vol 28 (2) ◽

pp. 185-193 ◽

Cited By ~ 4

Author(s):

M. Pala ◽

A. Mazid

Keyword(s):

Grain Yield ◽

Weed Control ◽

Crop Production ◽

Economic Loss ◽

Sowing Date ◽

Fertilizer Application ◽

Late Winter ◽

Production Practices ◽

On Farm ◽

Phosphorus Application

SUMMARYThe production of lentil (Lens culinaris) was examined in 24 on-farm trials conducted over three seasons (1985/86 to 1987/88) in northwest Syria to examine the main effects and interaction of sowing date, weed control, Sitona weevil control, and fertilizer application (phosphorus and nitrogen). Advancing the date of sowing from late winter (mid January) to early winter (mid-November) resulted in an increased yield of grain and straw in all years across locations. Responses to phosphorus application were also significant in all years. Controlling Sitona weevil increased grain yield by 20% in early sown crops and by 14% in those that were sown late. Weed control by the pre-emergence application of cyanazine and pronamide increased grain yield by 59% in early sowings and by 20% in late sowings. Economic analysis of the improved production practices showed that early sowing combined with the control of Sitona and weeds, and phosphorus application, gave the highest probability of an increase in net revenue with virtually no risk of economic loss to the farmer.

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ON-FARM EVALUATION OF THE EFFECTS OF THE PRINCIPLES AND COMPONENTS OF CONSERVATION AGRICULTURE ON MAIZE YIELD AND WEED BIOMASS IN MALAWI

Experimental Agriculture ◽

10.1017/s001447971400009x ◽

2014 ◽

Vol 50 (4) ◽

pp. 591-610 ◽

Cited By ~ 15

Author(s):

A. R. NGWIRA ◽

JENS B. AUNE ◽

C. THIERFELDER

Keyword(s):

Weed Control ◽

Crop Residues ◽

Smallholder Farmers ◽

Conservation Agriculture ◽

Maize Yield ◽

Crop Productivity ◽

Fertilizer Application ◽

Residue Management ◽

No Tillage ◽

On Farm

SUMMARYAn on-farm study was conducted from 2009 to 2012 with communities in the Manjawira, Mpingu and Zidyana Extension Planning Areas in the Ntcheu, Lilongwe and Nkhotakota districts of central Malawi. The aim of the study was to evaluate the effects of the principles (no-tillage and mulching) and components (fertilization and weeding) of conservation agriculture (CA) on crop productivity and weeds, and the interactions between principles and components, and to suggest strategies for introducing CA to smallholder farmers. The treatments consisted of tillage, fertilizer application, residues management and weed control strategies. While combined analysis showed that mulching is as effective as tillage in controlling weeds, the interaction between site and treatment revealed that in the more humid environment of Zidyana, weed dry matter obtained under no-tillage and residues plus fertilizer (NT+F+R) was 0.6 mg ha−1lower than under CP+F. Results suggest that about 6.0 mg ha−1of mulch is required to have a similar effect as tillage in controlling weeds. Fertilizer had an overriding effect on maize yield, regardless of tillage and crop residue management. Mulching was beneficial over tillage in the drier environment of Manjawira, where maize yield obtained under NT+F+R was 1.2 mg ha−1greater than under CP+F. Our results show that the introduction of no tillage has benefits only if it is accompanied by fertilizer application, retention of crop residues as surface mulch, and improved weed control. Increasing availability and accessibility of inputs (fertilizers and herbicides) to farmers is critical for adoption of CA at scale in Malawi.

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Physiological characteristics of grain filling in high quality winter wheat under different fertilizer application dose and plant density

CHINESE JOURNAL OF ECO-AGRICULTURE ◽

10.3724/sp.j.1011.2009.00890 ◽

2009 ◽

Vol 17 (5) ◽

pp. 890-894

Author(s):

Jian-Hua LIU ◽

Jun-Yi NIU ◽

Zhi-Li YAN

Keyword(s):

Winter Wheat ◽

Plant Density ◽

Grain Filling ◽

Fertilizer Application ◽

Physiological Characteristics ◽

High Quality

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The effects of plant density and fertilizer application on yield components in three marrow-stem kale (Brassica oleracea L.) varieties

The Journal of Agricultural Science ◽

10.1017/s0021859600023509 ◽

1971 ◽

Vol 77 (1) ◽

pp. 83-89 ◽

Cited By ~ 2

Author(s):

T. D. Johnston

Keyword(s):

Brassica Oleracea ◽

Plant Height ◽

Yield Components ◽

Plant Density ◽

Fertilizer Application ◽

Varietal Differences ◽

Crop Density ◽

Leaf Yield ◽

Brassica Oleracea L ◽

Effects Of Density

SummaryThe effects of crop density and fertilizer application on three varieties of marrowstem kale were investigated. The yield of stem, yield of leaf, components of leaf yield and plant height were studied separately. Varietal differences and effects of density and fertilizer application were significant for all characters, except for the effect of crop density on leaf and stem yield per ha.Significant variety x treatment interactions occurred for a number of the characters measured. The possible importance of these is discussed.

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Fall and spring seeding date effects on herbicide-tolerant canola (Brassica napus L.) cultivars

Canadian Journal of Plant Science ◽

10.4141/p03-149 ◽

2004 ◽

Vol 84 (2) ◽

pp. 419-430 ◽

Cited By ~ 16

Author(s):

G. W. Clayton ◽

K. N. Harker ◽

J. T. O’Donovan ◽

R. E. Blackshaw ◽

L. M. Dosdall ◽

...

Keyword(s):

Field Experiments ◽

Plant Density ◽

Early Spring ◽

Yield Response ◽

Management Options ◽

Brassica Napus L ◽

Seeding Date ◽

Herbicide Tolerant ◽

Root Maggot ◽

Crops Yield

More flexible and effective weed control with herbicide-tolerant B. napus canola allows for additional seeding management options, such as fall (dormant) and early spring (ES) seeding. Field experiments were conducted at Lacombe and Beaverlodge (1999–2001), Didsbury (1999–2000), and Lethbridge (2000–2001), Alberta, Canada, primarily to evaluate the effect of fall (late October-November), ES (late April-early May), and normal spring (NS) (ca. mid-May) seeding dates on glufosinate-, glyphosate-, and imidazolinone-tolerant canola development and yield. Fall seeding resulted in 46% lower plant density and nearly double the dockage than spring seeding. ES-seeded canola had 19% higher seed yield and 2.1% higher oil content than fall-seeded canola. ES seeding significantly increased yield compared to fall-seeded canola for 8 of 10 site -years or compared to NS seeding for 4 of 10 site-years; ES-seeded canola equalled the yield of NS-seeded canola for 6 of 10 site-years. Yield response to seeding date did not differ among herbicide-tolerant cultivars. Seeding date did not influence root maggot damage. Seeding canola as soon as possible in spring increases the likelihood of optimizing canola yield and quality compared to fall seeding and traditional spring seeding dates. Key words: Dormant seeding, seeding management, root maggot, herbicide-resistant crops, yield components, operational diversity

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Storage Root Yield of Sweetpotato as Influenced by Sweetpotato leaf curl virus and Its Interaction With Sweetpotato feathery mottle virus and Sweetpotato chlorotic stunt virus in Kenya

Plant Disease ◽

10.1094/pdis-06-19-1196-re ◽

2020 ◽

Vol 104 (5) ◽

pp. 1477-1486

Author(s):

Bramwel W. Wanjala ◽

Elijah M. Ateka ◽

Douglas W. Miano ◽

Jan W. Low ◽

Jan F. Kreuze

Keyword(s):

Yield Loss ◽

Virus Disease ◽

Block Design ◽

Mottle Virus ◽

Yield Response ◽

Yield Reduction ◽

Root Yield ◽

Moderately Resistant ◽

Leaf Curl Virus ◽

Leaf Curl

In this study, the effect of a Kenyan strain of Sweetpotato leaf curl virus (SPLCV) and its interactions with Sweetpotato feathery mottle virus (SPFMV) and Sweetpotato chlorotic stunt virus (SPCSV) on root yield was determined. Trials were performed during two seasons using varieties Kakamega and Ejumula and contrasting in their resistance to sweetpotato virus disease in a randomized complete block design with 16 treatments replicated three times. The treatments included plants graft inoculated with SPLCV, SPFMV, and SPCSV alone and in possible dual or triple combinations. Yield and yield-related parameters were evaluated at harvest. The results showed marked differences in the effect of SPLCV infection on the two varieties. Ejumula, which is highly susceptible to SPFMV and SPCSV, suffered no significant yield loss from SPLCV infection, whereas Kakamega, which is moderately resistant to SPFMV and SPCSV, suffered an average of 47% yield loss from SPLCV, despite only mild symptoms occurring in both varieties. These results highlight the variability in yield response to SPLCV between sweetpotato cultivars as well as a lack of correlation of SPLCV-related symptoms with yield reduction. In addition, they underline the lack of correlation between resistance to the RNA viruses SPCSV and SPFMV and the DNA virus SPLCV. [Formula: see text] Copyright © 2020 The Author(s). This is an open access article distributed under the CC BY 4.0 International license .

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Weed Population and Crop Yield Response to Recommendations from a Weed Control Decision Aid

Agronomy Journal ◽

10.2134/agronj1999.00021962009100030006x ◽

1999 ◽

Vol 91 (3) ◽

pp. 386-392 ◽

Cited By ~ 13

Author(s):

Melinda L. Hoffman ◽

Douglas D. Buhler ◽

Micheal D. K. Owen

Keyword(s):

Weed Control ◽

Crop Yield ◽

Decision Aid ◽

Yield Response ◽

Weed Population ◽

Control Decision

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Effect of Harvest Time and Nitrogen Doses on Cassava Root Yield and Quality

Revista Brasileira de Ciência do Solo ◽

10.1590/18069657rbcs20150204 ◽

2017 ◽

Vol 41 (0) ◽

Cited By ~ 1

Author(s):

Natália Trajano de Oliveira ◽

Sandra Catia Pereira Uchôa ◽

José Maria Arcanjo Alves ◽

José de Anchieta Alves de Albuquerque ◽

Guilherme Silva Rodrigues

Keyword(s):

Harvest Time ◽

Root Yield ◽

Yield And Quality ◽

Cassava Root

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Desempenho agronômico de mandioca de mesa manejada com irrigação e uso de cobertura plástica do solo

Colloquium Agrariae ◽

10.5747/ca.2020.v16.n6.a406 ◽

2020 ◽

Vol 16 (6) ◽

pp. 47-55

Author(s):

Jorge Cesar dos Anjos Antonini ◽

Eduardo Alano Vieira ◽

Josefino de Freitas Fialho ◽

Fernando Antônio Macena ◽

Krishna Naudin ◽

...

Keyword(s):

Soil Cover ◽

Agronomic Performance ◽

Root Yield ◽

Cassava Root ◽

Crop Development ◽

Effective Depth ◽

Shoot Weight ◽

Individual Use ◽

The Individual ◽

Sweet Cassava

Although cassava is recognized for its high tolerance to drought, irrigation is showing satisfactory results. However, few studies have been carried out to determine the effects of soil cover, irrigation and the combination of both on crop development. Theobjective of this study was to determine the influence of irrigation and plastic soil cover on the agronomic performance of sweet cassava. The planting was done in beds, in thedouble row system with the stem cutingsimplanted vertically, with 0.60m between rows and 0.80 m between plants. The following treatments were applied: naked non-irrigated bedding, bedding covered with non-irrigated black polyethylene plastic, naked bedding with irrigation and bedding covered with irrigated black polyethylene plastic. Irrigation wasperformedby conventional sprinkling, based on the daily soil water balance at the effective depth of the cassava root system in the different stages of crop development. The characters evaluated were: shoot weight, root yield, starch percentage in the roots and time for cooking. The expression of the characters shoot weight, root yield and starch percentage in the roots wassignificantly influenced by irrigation managementandsoil cover. The individual use of irrigation and plastic soilcover technologies led to increases in root yieldof 55% and 13%, respectively, and when used together, root yieldincreased by 89%.

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