Importance of Corn's (Zea mays L.) crop is justified by its nutritious content especially because of the presence of high protein, minerals, vitamins and other energetic nutrients. In Côte d'Ivoire, maize production is insufficient and various strategies have been developed to improve its production. Present study was conducted in a ferralitic soil at the UJLoG's research station to evaluate the effect of two different ages (storage time) of chicken manure on growth and yield of GMRP-18 (an improved corn variety) and Bon-maïs (used for popcorn) varieties. Single dose of poultry manure at the rate of 7 t/ha was used in combination with 70 kg/ha. Various growth traits like germination rate, height, diameter, number of leaf, ear insertion level, number of ear per plant and yield have been evaluated. Results of study revealed positive impact of the manure on the growth and development of corn crops and highlighted the possibility of improving corn productivity in Daloa region by using poultry manure. Furthermore, higher plants growth was reported under the influence of fertilizer as compared to controls. Final yield is significantly enhanced by the contribution of manure and highest yield was reported on the six days wind stored poultry manure applied at the rate of 7t.ha -1 .
La présente étude vise à déterminer et comparer l'influence du fumier de bovin et du compost d'ordures ménagères sur le statut organo-minéral d'un sol sableux utilisé en maraîchage à Daloa (Côte d'Ivoire). Méthodologie et résultats : Un essai agronomique portant sur l'espèce de laitue Lactuca sativa a été mis en place. Cet essai constitué de blocs aléatoires complets répétés trois fois consistait en trois traitements : un témoin ou sol sans amendement, un apport au sol de 40 t/ha, d'une part de fumier de bovin, et d'autre part de compost d'ordures ménagères. La valeur fertilisante des amendements a été déterminée par des analyses de laboratoire effectuées sur leurs échantillons. L'effet induit sur le sol par les amendements a été déterminé par l'analyse d'échantillons de sol provenant des différents traitements. En outre, la biomasse fraîche totale produite par chaque traitement a été déterminée. Les résultats ont montré une augmentation du stock de matières organiques dans les sols amendés, notamment le sol ayant reçu le fumier. Par conséquent, la CEC, les niveaux de phosphore, potassium, magnésium, calcium et sodium de ces sols ainsi que leur productivité ont été améliorés significativement. Conclusion et application des résultats : Le fumier de bovin ayant présenté une valeur fertilisante des sols plus intéressante et permis une meilleure productivité du sol étudié peut être recommandé à la dose de 40 t/ha pour la fertilisation des sols sableux. Mots clés : Amendement organique, Statut organo-minéral, Productivité, Sol sableux. Comparative analysis of the effects of two organic amendments on the organo-mineral status and productivity of a sandy soil ABSTRACT Objectives : The present study aims to determine and compare the influence of cattle manure and waste compost on the organo-mineral status of a sandy soil used for market gardening in Daloa (Côte d'Ivoire). Methodology and results : An agronomic test on lettuce species Lactuca sativa has been put in place. This trial consisting of complete randomized blocks repeated three times consisted of three treatments : a control or unmodified soil and a feed of 40 t/ha, on the one hand, of cattle manure, and on the other hand, of compost was determined. The results showed an increase in the stock of organic matter in the amended soils. As a result, their levels of CEC, phosphorus, potassium, magnesium, calcium, sodium and their productivity have been significantly improved. Conclusion and applications of results: For having presented a more interesting soils fertilizer value in general and allowed a better productivity of the soil studied, cattle manure can be recommended at the feed of 40 t/ha to the fertilization of sandy soils.
This study was carried out to investigate the relationship between earthworm trophic groups and soil morphology and chemical attributes, and moreover, to determine which of these attributes would be most significant in explaining the distribution of earthworm communities in agro-ecosystems in the Centre-West region of Côte d'Ivoire. Earthworms' soil morphology and soil samples were studied in three agro-ecosystems: 20-year-old cocoa plantations, 5-year-old mixed cocoa plantations and mixed crop-fields. The semi-deciduous forests near the agro-ecosystems were also sampled and considered as control plots. Earthworm global densities varied on average between 53.9 ± 7.9 and 86.0 ± 19.0 individuals m −2 and biomass between 16.5 ± 3.1 and 20.6 ± 4.1 g m −2 under these ecosystems. Path analysis produced a significant model: soil morphology and chemical attributes under different agro-ecosystems affected the density and biomass of earthworm trophic groups, and these attributes are potential regulators of the fauna communities. The morphological components related to dead leaves (r 2 = 0.73, P < 0.05) and fine woods quantities (r 2 = 0.71, P < 0.05) are most decisive for detritivore abundances, whereas geophageous mesohumic abundances were positively affected by soil organic carbon (r 2 = 0.79, P < 0.05) and N (r 2 = 0.84, P < 0.05) and geophageous polyhumic abundances were positively affected only by soil N (r 2 = 0.63, P < 0.05). In agro-ecosystems the relationship between soil conditions and earthworm communities varied between earthworm trophic groups, so detritivores were more affected by litter quantity, whereas shallow geophageous populations were guided by soil organic matter.
In the department of Daloa in Côte d'Ivoire, many coffee and cocoa plantations that have fallen into decline and been left fallow are in the process of being reclaimed by their former or new users. In order to prevent the failure of the planned new crops, this study was initiated to determine how the soils under these fallows function, which is essential for developing sustainable management strategies for them. Thus, seven fallows older than ten years were identified. In each of them, a 10,000 m2 plot was delimited and three soil pits were set up. In one pit, three soil samples were taken. After analysis of these samples in the laboratory, correlations and balances between certain physico-chemical soil components were calculated. The results show that organic matter contributes in some places to the constitution of the CEC (r ˃ 0.70) and thus participates in the soil's function as a reservoir of nutrients. On the other hand, when the soils are leached, the organic matter binds to the sand remaining in the profile and, because of its coarse particles, it hardly contributes to the constitution of the CEC (r = -0.70). However, whatever the case, the stability balances between the soil nutrients are globally favourable due to the long duration of the fallows (Ca/Mg close to 2 while K/Mg, (Ca+K)/Mg and C/N varied from 0.10 to 0.50, 15 to 30 and 9 to 12, respectively). Pending consideration of the functioning of the biological component of the soils studied, organic matter appears to be the most determining factor in their overall functioning.
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