| Summary: | Soybean (Glycine max L.) is one of important agricultural commodities.
Unfortunately, the high demand of soybean cannot be fulfilled by local production.
Various attempts have been done to increase soybean productivity, one of them is the
utilization of fertilizers. The aim of this research was to evaluate the effects of
fermented earthworm liquid fertilizer on vegetative growth of soybean (Glycine max
L.). The experiment was arranged in a randomized complete block design (RCBD)
with 2x6 factorial and seven replications for each combination treatment. The first
factor was application methods of fertilizer: pouring the fertilizer on the soil (C1) and
spraying the fertilizer to the leaves (C2). The second factor was fertilizer dosages: 0
ml/L (D0), 5 ml/L (D1), 10 ml/L (D2), 15 ml/L (D3), 20 ml/L (D4), and 25 ml/L
(D5). Parameters observed were plant height, number and leaf area, number of root
nodules, nitrate reductase activity, total chlorophyll content, dry weight, stomatal
density, and length of epidermal stem cells. The results of this research showed that
application of liquid fertilizer by pouring (C1) and spraying (C2) did not influence
the number of leaves, nitrate reductase activity, and total chlorophyll content. C2
treatment increased the risk of leaf tissue damage. C1 treatment increased some
parameters of vegetative growth, such as plant height, leaf area, number of root
nodules, dry weight, stomatal density, and length of epidermal stem cells. Based on
this research, the optimal treatment combination to increase the vegetative growth of
soybean (Glycine max L.) is by pouring 25 ml/L fermented earthworm liquid
fertilizer.
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