Azolla: Potential Biofertilizer for Increasing Rice Productivity, and Government Policy for Implementation

Thapa, Parbati; Poudel, Kabita

doi:10.26480/jwbm.02.2021.62.68

Cited by 14 publications

(8 citation statements)

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“…The positive impact on nitrogen uses efficiency (NUE) resulting from the application of Azolla and rice straw, both in full and with 50% reduced nitrogen, aligns consistently with various NUE components, including internal utilization efficiency of nitrogen (IUNE), partial factor productivity of nitrogen (PFPN), and apparent recovery efficiency of nitrogen (PEN). This favorable influence of Azolla + rice straw and synthetic fertilizers on NUE is in line with findings reported by several authors (35,73,91,92). The underlying premise is that this combination enhances N retention, reduces N losses, and ultimately improves crop N uptake.…”

Section: Effect Of Fertilizer Treatments On N Uptake and Agronomic N ...supporting

confidence: 91%

Rice straw incorporation and Azolla application improves agronomic nitrogen-use-efficiency and rice grain yields in paddy fields

Marzouk,

Semoka,

Amuri

et al. 2024

Front. Soil Sci.

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In paddy soils, excessive application of N fertilizer often results in substantial N losses due to low N utilization efficiency. However, this condition can be mitigated by enhancing soil organic carbon content. Two-year field experiment was carried out at Mkula Irrigation Scheme in Kilombero Valley, Tanzania with the aim of investigating the impact of Azolla, rice straw incorporation and reduced levels of nitrogen input from NPKS-containing fertilizers on N use efficiency, soil chemical properties and rice grain yield. Assuming that this technology will introduce a novel perspective to the research, shedding light on alternative and potentially more sustainable methods for nitrogen management in paddy soils, it will be particularly relevant in sub-Saharan Africa, where the annual cost of chemical fertilizers is expected to continue rising. The treatments involved absolute control, half dose N (50 kg N ha-1), full dose N (100 kg N ha-1), and combination of these N doses with PKS, dry Azolla (3.4 t ha-1) and rice straw (6.9 t ha-1) through omission approach. The soil of the experimental area was sandy clay loam in texture, very strongly acid (pH 4.8), normal electrical conductivity (0.06 dS m-1), low amounts of recorded organic carbon (1.35%), total nitrogen (0.33%), 0.68 mg kg−1 available P, exchangeable potassium (0.15 cmol(+) kg−1), calcium (0.19 mg kg−1) and sodium percentage (3.75%), with very low cation exchange capacity (1.6 cmol(+) kg−1). The results showed that combination of Azolla, rice straw +100 kg N ha-1 + 30 kg P ha-1 + 30 kg K ha-1 + 20 kg S ha-1 resulted in higher rice grain yield, nitrogen uptake and agronomic efficiency of N. Azolla, being an effective biofertilizer, significantly contributes to nitrogen fixation and soil enrichment. Interestingly, this study demonstrates that co-application of Azolla, rice straw, and 50% reduced N is effective for achieving high rice yields, minimizing over-dependence on chemical N fertilizer, sustainable agricultural development, and environmental conservation.

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Section: Effect Of Fertilizer Treatments On N Uptake and Agronomic N ...supporting

confidence: 91%

Rice straw incorporation and Azolla application improves agronomic nitrogen-use-efficiency and rice grain yields in paddy fields

Marzouk,

Semoka,

Amuri

et al. 2024

Front. Soil Sci.

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“…Overall, the addition of organic fertilizers results in improved acquisition of NPK nutrients; in contrast, using synthetic fertilizers (as a full recommended dose) is a corollary to achieving NPK status in both plants and their cultivated soil. Moreover, the addition of organic fertilizers can substantially decrease the amounts of synthetic fertilizer required [49,59,60].…”

Section: Discussionmentioning

confidence: 99%

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

et al. 2022

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The excessive application of synthetic fertilizers can result in severe environmental risks, while composting green and fresh feedstocks can provide slow-release nutrients. Therefore, the aim of the current investigation was to study the effects of eight individual and combination treatments of azolla compost and NPK synthetic fertilizers (control = no fertilizer and compost; 100% NPK = full recommended dose of synthetic fertilizers as follows: 165 kg N/ha−1, 37 kg P2O5/ha−1 and 50 kg K2O/ha−1; 70% NPK; 40% NPK; 100% azolla compost (5 t DM ha−1); 50% NPK + 50% azolla compost; 70% NPK + 30% azolla compost and 40% NPK + 60% azolla compost) on rice growth, productivity and nutrient uptake in semi-arid agro-ecosystems. The results indicated that the combination of 40% NPK + 60% azolla compost or 50% NPK + 50% azolla compost resulted in the most optimal growth and the highest yield components. In addition, the application of 40% NPK + 60% azolla compost exhibited similar rice grain yields (10.76 t ha−1) as well as N, P, and K content and uptake compared with the full recommended dose of NPK fertilizer (100% NPK). This study declared that the utilization of azolla compost as an individual or combination application can reduce usage of synthetic fertilizers by up to 60% without significant reduction in the growth and grain productivity of rice.

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“…6. Because Azolla decomposes quickly, the nitrogen it has absorbed, as well as phosphorus and other nutrients it may have noticed in the water, possibly in competition with the rice, are quickly released back into the medium and made available to the rice to grow during crop development (Thapa et al, 2021). 7.…”

Section: Advantages Of Azolla Azolla As a Biofertilizer For Rice Prod...mentioning

confidence: 99%

Water Fern- Azolla: A Review

Chandrababu¹,

Parvathy

2022

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The Azolla-Anabaena symbiosis is distinguished by its high productivity and ability to fix nitrogen at high rates. As a result, numerous studies on this association have been conducted over the last few decades, with insufficient synthesis and coordination. As a result, this paper attempts to review and summarise previous and recent findings on the biology and applications of azolla in the hope of facilitating increased future collaborative research on this green gold mine. Azolla is a plant in the Azolla genus. Azolla derived from water can be used as human food, animal feed, green manure, organic fertiliser and to increase soil fertility, as well as for biological wastewater remediation and salt soil reclamation. Because of its high nutritional quality and protein content, azolla is suitable for human consumption as well as as a feed additive for a variety of animals such as fish, ducks, cattle, poultry and others to reduce feed costs. It is also used in the production of biogas and hydrogen, as well as as astronaut food in space. This review provides an overview of Azolla’s benefits as well as new developments in its various fields of application.

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Azolla: Potential Biofertilizer for Increasing Rice Productivity, and Government Policy for Implementation

Cited by 14 publications

References 0 publications

Rice straw incorporation and Azolla application improves agronomic nitrogen-use-efficiency and rice grain yields in paddy fields

Rice straw incorporation and Azolla application improves agronomic nitrogen-use-efficiency and rice grain yields in paddy fields

Azolla Compost as an Approach for Enhancing Growth, Productivity and Nutrient Uptake of Oryza sativa L.

Water Fern- Azolla: A Review

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