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Azolla advances as aid to rice production






Far Eastern Agriculture (July/August): 12-15

Azolla advances as aid to rice production

The role of Azolla, an aquatic fern which forms a symbiosis with the N-fixing cyanobacteria Anabaena azollae, in rice production in Asia is discussed. Local conditions and rice dictate cultural practices, but 4 basic techniques are used: monocropping of Azolla and ploughing/trampling into the soil prior to rice transplanting; intercropping with rice; a combination of mono- and intercropping; and production outside of rice lands and incorporation in fresh or composted form.


Accession: 001534349



Related references

Adhikary, B.H.; Swatdee, P.; Vangnai, S.; Attanandana, T.; Sripichitt, P., 1996: Enhancing effect of nitrogen and phosphorus on Azolla (Azolla microphylla) in rice production in acid sulphate soil. In a field trial at Pathumthani Rice Research Centre in the 1995/96 rainy season, the effects of different inoculation treatments with A. microphylla, P application methods, and presence or absence of N fertilizer were determined for transplanted...

Adhikary, B.H.; Vangnai, S.; Attanandana, T.; Swatdee, P.; Sripichitt, P., 1997: Growth and nitrogen production rates of Azolla (Azolla microphylla) as affected by its cultivation methods: an economic perspective in rice cultivation in Thailand. In a field trial on acid sulfate soil, Azolla was grown 20 days before transplanting rice and incorporated at transplanting, or was grown together with rice and not incorporated. Growth rate of Azolla did not differ significantly between these tre...

Ventura, W.; Watanabe, I.; Mascarina, G.B., 1992: Mineralization of Azolla N and its availability to wetland rice. II. Fertilizer effect and 15N uptake by rice from different species of Azolla with varying N contents. N utilization by wetland rice was studied using A. microphylla, A. pinnata var. imbricata, A. pinnata var. pinnata and A. mexicana with different N contents as green manures. In one experiment, 15N labelled Azolla was used, and the 15N recoveries...

Lin, C.J., 1983: Studies on the use of Azolla for increasing soil fertility in rice and on the suppression of weeds by Azolla mats in rice paddies. Hot- and cold-resistant strains of A. pinnata (Da Li, Taiwan) and A. microphylla (Paraguay) were grown as a basal green manure for rice and after 21 days growth had increased in biomass from 0.75 to 19 t/ha. This green manure contained 47 and 39 k...

Ventura, W.; Watanabe, I.; Mascarina, G., B., 1992: Mineralization of Azolla nitrogen and its availability to wetland rice: II. Fertilizer effect and nitrogen-15 uptake by rice from different species of Azolla with varying nitrogen contents. Nitrogen utilization by wetland rice was studied using four species of Azolla: A. microphylla, A. pinnata var. imbricata, A. pinnata var. pinnata, and A. mexicana. Azolla species with different N contents were obtained by changing the P nutrition,...

Talukdar H.; Barthakur H.P., 1982: Biomass production of azolla and its effect on rice production. The rate of azolla [Azolla pinnata] biomass production increased from April; attained maximum in June and minimum in Aug. and then remained stable from Sept.-Nov. under Jorhat [India] conditions. Incorporation of 5 t [tons]/ha of fresh azolla just...

Tuan, D.T.; Thuyet, T.Q., 1979: Use of azolla in rice production in Vietnam. The development of research on azolla cultivation in Vietnam is reviewed. It is used as a winter crop in rice field rotations after spring and summer rice. In 2 months it produces 10 t green manure/ha corresponding to 25 kg N/ha.

Kanareugsa, C.; Swatdee, P.; Khonthasuvon, S.; Loudhapasittiporn, L.; Suphakumnerd, N., 1984: Azolla for rice production in Thailand. Azolla may provide a suitable alternative to chemical N fertilizers for rice production in Thailand. Normally it would be introduced 20 days before transplanting but in rainfed areas where the period of water supply is too short, Azolla may be int...

Liu, C.C., 1979: Use of azolla in rice production in China. The use of azolla in China is discussed. Azolla cultivation in paddy fields increased rice grain yields by 6.9-42.5%. The opt. method of incorporating the azolla into the soil was by turning it under by hand just before planting the rice, and turn...

Singh, P.K., 1979: Use of azolla in rice production in India. The use of azolla in India is reviewed. Grain yields of high yielding rice cv. were increased by 9-54% by azolla incorporation before planting. In the kharif [monsoon] season of 1977 a basal dressing of 10 t azolla/ha and a top dressing of 15 t/ha...