Different organic manure sources and NPK fertilizer on soil chemical 3 properties, growth, yield and quality of okra

Adekiya, A.O and Ejue, Wutem S. and Olayanju, T.M.A. and Dunsin, O and Aboyeji, C.M and Aremu, C. O. and Adegbite, K. A. and Akinpelu, Olanike (2020) Different organic manure sources and NPK fertilizer on soil chemical 3 properties, growth, yield and quality of okra. bioRxiv.

Text 2020.06.01.127498v1.full.pdf - Accepted Version Download (252kB)

Abstract

Use of organic manures to meet the nutrient requirement of crop would be an inevitable practice 29 in the years to come for sustainable agriculture since organic manures generally improve the soil 30 physical, chemical and biological properties. Hence, field experiments were carried out in 2017 31 and 2018 to compare the impact of different organic manures and NPK fertilizer on soil properties, 32 growth, yield, proximate and mineral contents of okra (Abelmoschus esculentus L.). The 33 treatments each year 2017 and 2018 consisted of: rabbit manure, cow dung, poultry manure, green 34 manure [Mexican sunflower (Tithonia diversifolia Asteraceae)], pig manure, NPK 15- 15-15 35 fertilizer applied at 120 kg N ha-1 and a control (no manure/ inorganic fertilizer). The seven 36 treatments were laid out in a randomized complete block design with three replication. Organic 37 manures and NPK fertilizer increased the soil organic matter (OM), N, P, K, Ca and Mg (NPK 38 fertilizer did not increase OM, Ca and Mg significantly), growth, yield, minerals, protein, ash, 39 carbohydrate and mucilage contents of okra fruit as compared with control. Organic manures 40 improved okra yield compared with NPK fertilizer. Okra growth and yield parameters were 41 significantly higher in 2018 compared with 2017. Control, rabbit manure, cow dung, poultry 42 manure, green manure, pig manure and NPK fertilizer in 2018 increased the pod yield of okra by 43 9.7%, 35.3%, 57.9%, 36.2%, 39.2%, 45.5% and 3.2%, respectively compare with the same 44 treatment in 2017. Amongst various organic manures, poultry manure produced significantly 45 higher plant growth, yield, mineral and proximate composition of okra because of its high soil 46 chemical properties which could be related to its lowest C: N ratio, lignin and lignin: N ratio. 47 Results also showed that okra grown during high intensity rainfall has higher yield but with 48 reduced quality except its mucilage content. Therefore, planting of okra with poultry manure under 49 moderate rainfall will enhance the health benefit from the fruit, however, those that desire its 50 mucilage content planting during high rainfall is recommended.

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