Abstract:
The role of organic fertilizer in the soil is the addition of organic matter in the soil that serves as a
source of plant nutrients, improve the ability of the soil porosity which improves soil aeration and
drainage, increase the activity of soil microorganisms, improve the structure and texture of the
soil, maintain soil fertility, can save water and not pollute the environment. Some blue-green algae
species specific (blue-green algae) such as Cyanophyceae sp has the ability to perform
photosynthesis and nitrogen binding, and this is an advantage which is the mainstay in this study
to make it as a source of nitrogen derived from microorganisms which are renewable, as an
organic fertilizer because it contains minerals such as potassium and hormone Auxin and cytokinin
that can enhance plant growth, accelerate the period of flowering and fruiting. Algae as an organic
fertilizer are hydrocolloids that can be used to absorb water and become a good substrate for soil
microorganisms. On the other hand, Trichoderma sp is a natural decomposer containing cellulase
enzymes, enzyme selubiose (ß-glucosidase) and chitinase enzyme that can work synergistically to
accelerate the weathering process of organic material. In addition, Trichoderma sp. potentially be
used as a control pests and diseases that are safe for the environment and improve plant resistance
(with the mechanism of induction of resistance by producing phytoalexin or increase plant
resistance) against the pathogen. Use of Trichoderma sp as the decomposer of organic as well as
biological control and algae as organic fertilizer (which we called TrichoAlgae) is expected to be
effective and the potential to break down algae into organic fertilizer, as well as biological control
against the pathogen. Trichoderma pseudokoningii have higher chitinase activity than the other
isolates. Trichoderma produce large amounts of extracellular chitinase enzyme which can degrade
the cell walls of pathogenic fungi. The research aim is to determinate the physical and chemical
properties Trichoalga The result of the research showed that applications TrichoAlgae able to
inhibit the intensity of the attack G. boninense amounted to 75.75%. TrichoAlgae at a dose of 40 g
/ polybags have a greater ability to increase plant growth.
