Intercropping and Nitrogen Management Effects on Diamondback Moth Damage and Yield of Collards in the Highlands of Kenya

Said, M. Sameh; Itulya, Francis M.

doi:10.4314/acsj.v11i1.27528

Cited by 11 publications

(15 citation statements)

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“…LER has been used as an estimator for land resource utilization in many agronomic studies (Yadav & Yadav 2000;Said & Itulya, 2003). Our data shows that Collard + Spring onion intercrop was better in land resource utilization compared to Collard + Chilli intercrop.…”

Section: Discussionsupporting

confidence: 55%

“…Intercropping and companion cropping have been a common practice in African agriculture, with most cereals and legumes grown as intercrops (Said and Itulya, 2003;Runkulatile et al, 1997;Wortmann, 1993). Although most farmers aim at obtaining yields from different crop species used, reports indicate other positive synergies in most of these cropping systems.…”

mentioning

confidence: 99%

“…Other vegetable production improvement approaches include the application of botanicals, as pesticides, and/or crude intercrop trials as pest control methods (Said and Itulya, 2003).…”

mentioning

confidence: 99%

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Agronomic Performance of Collards under Two Intercrops and Varying Nitrogen Application Levels as Assessed Using Land Equivalent Ratios

Mutiga

Gohole²,

Auma³

2011

JAS

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Sustainable utilization of the limited land parcels is an important element in resource poor countries whose populations depend on agriculture for sustenance. In East Africa, collard vegetable production has been a venture for many small-scale farmers. Since no approaches are possible in expanding the land resource, improved crop production techniques and management promise better yields. We report a potential and sustainable approach for collard production. We compared the productivity of growing collards in an intercrop with chilli or spring onions, and varying nitrogen levels in each cropping system in terms of land equivalent ratios (LER). Our two -season data show that farmers can obtain higher yield in a unit of land when they intercrop collards with spring onions as indicated by a LER of 1.06, and that growing collards in an intercrop with Chilli leads to a 14% wastage of land resource compared to growing the crop as a monoculture. Further, we reveal that application of nitrogenous fertilizer might lead to increase in yield but it does not have a statistically significant benefit on the land resource use.There were no statistically significant relationship between the yield of collards and their heights in all cropping systems, but a non-significant(r=-0.29, p=0.164) decline of yield was observed under collard + spring onion intercrop. The number of collard leaves was significantly negatively correlated (r=-0.456, p=0.0249) with yield LER under collard + spring onion intercrop but it did not influence the LER under collard + spring onion intercrop. These findings demonstrate the need for proper resource application, and that collard + spring onion intercrop has a potential to improve collard yield per unit piece of cultivated land without a need for increasing the rate of nitrogenous fertilizer application.

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Section: Discussionsupporting

confidence: 55%

mentioning

confidence: 99%

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Agronomic Performance of Collards under Two Intercrops and Varying Nitrogen Application Levels as Assessed Using Land Equivalent Ratios

Mutiga

Gohole²,

Auma³

2011

JAS

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“…Sankar et al (2007) stated that intercropping cabbage with garlic and onion significantly reduced the population of aphids on cabbage. Similarly, Said and Itulya (2003) indicated that the odour from onion is able to repel P. xylostella from settling on cabbage when in an intercrop. Garlic and onion produce a pungent alliaceous compound, allyl-epropyl-disulphide, which is responsible for its pest repellent attribute.…”

Section: Discussionmentioning

confidence: 99%

Onion as a Pest Control Intercrop in Organic Cabbage (Brassica oleracea) Production System in Ghana

Baidoo¹,

Mochiah²,

Apusiga³

2012

SAR

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The use of chemical insecticides in the control of insect pests has left in its wake resistance of some pests to some of the conventional insecticides. Alternative methods of managing pests such as cultural control have to be employed to reduce pest infestation of crops. Onion was used in an intercrop as a non host crop to manage the pests of cabbage. The experiment was conducted in a Randomized Complete Block Design with four treatments; sole cabbage (T1), 2 rows of cabbage to 1 row of onion (T2), 3 rows of cabbage to 1 row of onion (T3) and 4 rows of cabbage to 1 row of onion (T4), each of which was replicated three times. Data were collected on pests' numbers, plant height, damaged leaves at harvest, canopy spread, number of damaged heads and fresh weight. Significantly fewer Bemisia tabaci, Hellula undalis and Brevicoryne brassicae infested the intercropped plants than the sole crop. However, intercropping cabbage with onion did not significantly reduce Plutella xylostella population on cabbage. Number of damaged heads, fresh weight and damaged leaves were significantly different (P< 0.05).

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“…Srinivasan and Krishna (1991) reported that intercropping of non-host crops such as onion, tomatoes and pepper in cabbage could lead to the disruption of lifecycle of P. xylostella. Said and Itulya (2003) found that onion has repellent effect on diamondback moth. AsareBediako et al, (2010) recorded less infestation of diamondback moth on cabbage intercropped with onion and tomato.…”

Section: Third Generationmentioning

confidence: 99%

Field Life-Tables and Key Mortality Factors of Plutella xylostella Infesting Sole and Onion Intercropped Cabbage

Aravindarajan¹,

Dhandge²,

Anandmurthy³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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Intercropping and Nitrogen Management Effects on Diamondback Moth Damage and Yield of Collards in the Highlands of Kenya

Cited by 11 publications

References 0 publications

Agronomic Performance of Collards under Two Intercrops and Varying Nitrogen Application Levels as Assessed Using Land Equivalent Ratios

Agronomic Performance of Collards under Two Intercrops and Varying Nitrogen Application Levels as Assessed Using Land Equivalent Ratios

Onion as a Pest Control Intercrop in Organic Cabbage (Brassica oleracea) Production System in Ghana

Field Life-Tables and Key Mortality Factors of Plutella xylostella Infesting Sole and Onion Intercropped Cabbage

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