Addition of natural minerals or synthetic oxides in water-insoluble forms that contain micronutrients such as copper, zinc, and cobalt may improve the efficiency of PROM . Using natural sources of nitrogen, such as " Azolla ", may be more environmentally sound.
42.
More recently the surface of the lagoon has become gradually overgrown with aquatic macrophytes, primarily the non-native water-fern, Azolla filiculoides, and this has caused increased eutrophication, creating large areas of the lagoon where there is insufficient dissolved oxygen for fish to survive.
43.
It doubles its biomass in 3 10 days, depending on conditions, and yield can reach 8 10 tonnes fresh matter / ha in Asian rice fields . 37.8 t fresh weight / ha ( 2.78 t DM / ha dry weight ) has been reported for " Azolla pinnata " in India ( Hasan et al ., 2009 ).
44.
"' Salviniaceae "'( or formerly Salviniace?) is a family of heterosporous ferns in the order Salviniales . " Azolla " was previously placed in its own family, "'Azollaceae "', but recent research has shown " Azolla " and " Salvinia " to be sister genera with the likely phylogenic relationship shown in the following diagram.
45.
"' Salviniaceae "'( or formerly Salviniace?) is a family of heterosporous ferns in the order Salviniales . " Azolla " was previously placed in its own family, "'Azollaceae "', but recent research has shown " Azolla " and " Salvinia " to be sister genera with the likely phylogenic relationship shown in the following diagram.
46.
About 49 million years back, with the climate cooling and the atmosphere's greenhouse burden declining, the retrieved shafts of sediment also speak of an extraordinary, short-lived era of several hundred thousand years when so much warm fresh water apparently topped the Arctic's oxygen-starved salty depths that the polar sea became matted with tiny Azolla ferns, resembling the duckweed that can choke suburban ponds.
47.
Blue green algae belonging to a general cyanobacteria genus, " Nostoc " or " Anabaena " or " Tolypothrix " or " Aulosira ", fix atmospheric nitrogen and are used as inoculations for paddy crop grown both under upland and low-land conditions . " Anabaena " in association with water fern Azolla contributes nitrogen up to 60 kg / ha / season and also enriches soils with organic matter.
48.
Some of the domestic animals that were planned for the agricultural area during the first mission included four pygmy goats and one billy goat from the plateau region of Nigeria, 35 hens and three roosters ( a mix of Indian jungle fowl ( " Gallus gallus " ), Japanese silky bantam, and a hybrid of these ), two sows and one boar pig ( feral ), as well as tilapia fish grown in a rice and azolla pond system originating millennia ago in China.
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