Organic fertilizers are best for plants.
There are many different brands of seaweed fertilizer with Neptune’s Harvest (Amazon) being one of the more popular options.
As mentioned previously, the salt may wash out with the rain or when you water your garden.
How Much Alfalfa Meal Should I Use?
They’re eco-friendly and sustainable and contain micronutrients to enrich your soil.
The salt may get washed out by rainwater or hose down the soil after applying the fertilizer.
You may find it by different names such as bladderwrack or kelp.
Some gardeners may use a combination of seaweed and fish fertilizer to fertilize their house plants -this seaweed and organic fish emulsion (liquid fish) is sprayed in the foliar method.
Most agar is extracted from species of Gelidium (Figure 1) and Gracilaria (Figure 2). Closely related to Gelidium are species of Pterocladia , and small quantities of these are collected, mainly in the Azores (Portugal) and New Zealand. Gelidiella acerosa is the main source of agar in India. Ahnfeltia species have been used in both Russia and Japan, one source being the island of Sakhalin (Russia).
For Gracilaria , Chile is the largest supplier, although the harvest of wild seaweed has fluctuated over the last 5 years, from 121 000 wet tonnes in 1996 down to 73 000 tonnes in 1998, and back up to 137 000 wet tonnes in 2000. Cultivation has yielded about 33 000 wet tonnes for the last two years for which figures are available (1999 and 2000). China, Indonesia, Namibia and Viet Nam all supply between 12 000 and 18 000 wet tonnes each, in most cases from a mixture of wild and cultivated material. In Argentina, between 1985 and 1995, the harvest of dried Gracilaria varied from 1 700 to 3 100 tonnes. In India, harvests of wild Gracilaria and Gelidiella on the Tamil Nadu coast have varied between 750 and 1 300 dry tonnes from 1996 to 1999.
2.2 Natural habitats
Gracilaria , rehydrated from dried material purchased by an agar producer. The coin diameter is 20 mm.
Where the open-water bottom is a soft sediment, such as an intertidal mudflat or an estuary outlet, pieces of seaweed are forced into the sediment using a “y”-shaped fork planting tool, either by a diver or from a boat using a long wooden handle with the fork on the end. The buried portion of the plant grows laterally, anchoring the plant, and it also produces vertical shoots that develop into mature plants. When the bottom is sandy, forked pieces loosen before they can become established by growing new lateral shoots, so to overcome this a different method is used. Tubular plastic bags, about 1 m long by 30-40 cm diameter, are filled with sand, and pieces of seaweed are wound around the tube or fixed to it with an elastic band. The tubes are then placed on the sea bottom and the plant is held in place as it forms new horizontal shoots. Eventually the plastic bag disintegrates, but by then the plant is firmly attached to the bottom. However, the accumulation of large quantities of disintegrated plastic tubes, washed up on nearby shores, can be a problem. Other methods have included fixing pieces of seaweed to rocks using rubber bands or nylon mesh to hold it in place on the rock, and then placing the rocks on the sea bottom.
An epiphyte is a plant that grows on another plant but is not parasitic on it. Epiphytes can be a problem in all seaweed cultivation since they contaminate the crop unless they are removed. In the pond cultivation of Gracilaria , epiphytes can be a particular problem because the growing seaweed is not readily accessible to the farmer, as it lies on the bottom of the pond. Contrast this with cultivation on lines, where the farmer can periodically move along the lines and physically remove epiphytes at an early stage of contamination. Sometimes Gracilaria is grown in ponds with other marine species, such as tilapia or milkfish, that will control the epiphytes by grazing on them. This and other types of polyculture are discussed in more detail in a later section (Section 9.6).