THE EFFECT OF THINNING ON THE YIELD OF THREE NERICA VARIETIES (NERICA 4, NERICA 6 AND NERICA 7)

Famara Jaiteh

National Agricultural Research Institute

PMB 526, Serrekunda, The Gambia

ABSTRACT

The effect of thinning on the yield of three NERICA varieties (N4, N6 andN7 )was investigated in site three  at Banjulinding farm West Coast Region  during the rainy season  2011.A split-plot design with three replicates has three main plots divided into six sub-plots for the thinning and non-thinning of each varieties .

The results from the trial indicated that there was significant different in some yield related components like plant heights and culm length but there was no significant different in yield per hectare between varieties .NERICA 4 yield highest in thinning method than any other varieties, whiles NERICA 7 showed the highest yield in the non-thinning method .Generally all the three NERRICAs yield more in the non-thinning method than in the case of thinning.

Key words: Thinning, Hectare, Split-plot design, Varieties, yield

 System of Rice Intensification Trial in The Gambia

Soil Sample on SRI plot

Rice Yield Gap Survey Agronomy Data Collection In the Rice Hub of The Gambia

EFFECT OF DIFFERENT BOTANICALS AND COW DUNG ON ROOT- KNOT NEMATODES (MELOIDOGYNE SPP) ON TOMATO PLANT

ABSTRACT

 Tomato (Lycopersicon esculentus) is one of the most popular vegetable crops worldwide, owing to its high nutritive value and diversified use. Tomato production in Gambia is threatened by plant parasitic nematodes, especially the root knot nematodes (Meloidogyne spp.), which are responsible for huge economic yield losses. The losses, however, can be averted through use of botanicals. Screen house experiments were conducted to test the efficacy of cow dung and different botanicals separately and in combination in the control of root-knot nematode of tomato. Equal quantities of cow dung, botanical and their combination were separately made up to 200g with sterile soil. Two weeks old seedlings of tomato raised in nursery trays were transplanted into soil with treatments mixture and inoculated with eleven (11) second stage larvae of Meloidogyne spp. The experiment was Randomized Complete Block Design replicated three times and effects assessed based on plant height, stem girth, fruiting, fresh weigh, dry weight, extent of galling and the nematode multiplication factor. Results obtained showed that cow dung, botanicals and their combination produced significantly higher result than the untreated control. Similarly, the mixture of botanicals i.e.200g neem, 100g neem plus100g eucalyptus and 100g groundnut shell had a direct effect in drastically decreasing nematodes population. 

Key words: Meloidogyne spp, Lycopersicon esculentus, Screenhouse, 

                     botanicals, inoculate.

By   Famara Jaiteh

EVALUATION OF TOMATO GENOTYPES FOR RESISTANCE TO ROOT-KNOT

NEMATODES

F. JAITEH, C. KWOSEH1 and R. AKROMAH1

National Agricultural Research Institute (NARI) – PMB 526, Serrekunda, The Gambia

1Department of Crop and Soil Sciences, KNUST, Kumasi, Ghana

Corresponding author: fjaiteh@nari.gm

ABSTRACT

Tomato (Solanum lycopersicum) is one of the most popular vegetable crops worldwide, owing to its high

nutritive value and diversified use. Tomato production in Ghana is threatened by plant parasitic nematodes,

especially the root knot nematodes (Meloidogyne spp.), which are responsible for huge economic yield losses.

The losses, however, can be averted through use of resistant varieties. A study was conducted to evaluate tomato

genotypes reaction to root-knot nematodes. Five inoculum levels, 100, 500, 1000, 1500 and 2000 root-knot

nematode eggs per 1.6 litres of soil per pot were inoculated on tomato seedlings. A total of 33 genotypes were

screened for resistance to Meloidogyne spp. Nine tomato genotypes were collected from Burkina Faso, eight

from Vietnam, seven from the United States of America, three genotypes from South Africa, and six from local

agro-dealers and farmers in Ghana. The genotypes were screened in pots and the field for host resistance to

Meloidogyne spp. The 1500 eggs per plant inoculation level resulted in the highest number of eggs, juveniles and

fresh root weight. Among the 33 genotypes screened, Tomato Mongal T-11 and Tomato Beef Master were found

to be highly resistant to Meloidogyne spp. and also recorded the lowest reproductive factors of 0.71 and 0.53,

respectively.

Key Words: Ghana, host resistance, Meloidogyne sp., Solanum lycopersicum

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I am a young graduate working at the Agronomy unit of National Agricultural Research Institute. At our unit, we are conducting on-farm trials with smallholders farmers on fertilizer use efficiency, evaluation of cereal crops and vegetable genotypes in drought prone areas for tolerant to drought, poor soil conditions induced by climate change.