Abstract:
This research was conducted to evaluate the efficiency of a liquid organic fertilizer
using Azolla (Azolla pinnata) and cow dung on $owth and yield of okra. The
experiment was carried out during February 2023 to April 2023 at the Faculty of
Science, Eastern University Sri Lanka. The study was designed with five treatments
and four replicates Treatments are T1- Control (recommended amount inorganic
fertilizer by Department of Agriculture (DOA), T2- 2/3 of recommended inorganic
fertilizer by DOA and two times organic liquid fertilizer application, T3 - 2/3 of
recommended inorganic fertilizer by DOA and three times organic liquid fertilizer
application, T4 - 2/3 of recommended inorganic fertilizer by Department of
Agriculture and four times organic liquid fertilizer application and T5 - Four times
application of organic liquid fertilizer. All other agronomic practices were followed
based on DOA recommendation. Plant height, number of leaves per plant and leaf area
were measured in 2 weeks interval. Plant fresh weight and pod weight were measured
at the time of harvesting. Analysis of Variance was performed to determine significant
difference among treatments (p< 0.05).
The results showed that application of Azolla and Cow dung liquid fertilizer had
significant effects on growth and yield of Okra (Abelmoschus esculentus L.) over the
control. The results revealed that different number of application of Azolla + Cow
dung liquid organic fertilizer combined with inorganic fertilizer had significant
differences (p<0.05) on plant height, number of leaves per plants, leaf area, root length,
fresh weight of plant, fresh weight of leaves, dry weight of leaves, chlorophyll content,
number of flowers, fresh weight of pods and dry weight of pods. T4 had the highest
mean plant height compared to other treatments and T1 had the lowest height
compared to other treatments. Number of leaves was high in T4 whereas number of
leaves was low in T1. Furthermore, significant different (p>0.05) in yield was obtained
in T4 (30.85g/plant) and least value was observed in T1 (8.50g/plant). Among the all
tested treatments, 2/3 Inorganic fertilizer and four times of liquid fertilizer application
at top dressing (T4) could be used in okra cultivation to be obtain better yield. Usage
of Azolla organic liquid fertilizer would be a better alternative fertilizer in vegetable
cultivation.
