Agustina, L. (2011) Teknologi Hijau dalam Pertanian Organik Menuju Pertanian Berkelanjutan

• (Green Technology in Organic Agriculture Towards Sustainable Agriculture). Perpustakaan Nasional RI: Katalog Dalam Penerbitan\ Universiti Brawijaya Press (UB). ISBN: 978-602-8960-65-6. https://books.google.com.my/books?id=fOGfDwAAQBAJ&printsec=copyright&redir_esc=y#v=onepage&q&f=false [Accessed on 23 September 2021].

Amanullah and Hidayatullah (2016) Influence of Organic and Inorganic Nitrogen on Grain Yield and

• Yield Components of Hybrid Rice in Northwestern Pakistan. Rice Science, 23(6): 326–333. DOI: https://doi.org/10.1016/j.rsci.2016.02.007.

Azmi, M., Alias, I., Hassan, D.A., Ayob, A.H., Azmi, R., Badrulhadza, A. and Yahaya, S. (2008). Manual

• teknologi penanaman padi lestari (Sustainable rice cultivation technology manual). Serdang, Selangor : Institut Penyelidikan dan Kemajuan Pertanian Malaysia. Available online at: http://myagric.upm.edu.my/id/eprint/8347 [Accessed on 23 September 2021].

Ball, B.C., Bingham, I., Rees, R.M., Watson, C.A. and Litterick, A. (2005). The role of crop rotations in

• determining soil structure and crop growth conditions. Canadian journal of Soil Science, 85(5): 557-577. DOI: https://doi.org/10.4141/S04-078.

Cagauan, A.G, Branckaert, R.D. and van Hove, C. (2000) Integrating Fish and Azolla into Rice-Duck

• Farming in Asia. Naga, The ICLARM Quarterly, 23(1): 4-10. Available online at: https://digitalarchive.worldfishcenter.org/handle/20.500.12348/2423 [Accessed on 23 September 2021].

Constantino, K.P., Gonzales, E.J., Lazaro, L.M., Serrano, E.C. and Samson, B.P. (2015) Plant Height

• Measurement and Tiller Segmentation of Rice Crops Using Image Processing. Presented at the DLSU Research Congress 2015, De La Salle University, Manila, Philippines, March 2-4, 2015, 3: 1–6. Available online at: https://www.dlsu.edu.ph/wp-content/uploads/pdf/conferences/research-congress-proceedings/2015/FNH/021FNH_Samson_BPV.pd [Accessed on 23 September 2021].

Dobermann, A. and Fairhurst, T. (2000) Rice: Nutrient Disorders & Nutrient Management. In

• Medical Instrumentation (1st ed.). Potash & Phosphate Institute (PPI), Potash & Phosphate Institute of Canada (PPIC) and International Rice Research Institute (IRRI). Available online at: http://books.irri.org/9810427425_content.pdf [Accessed on 23 September 2021].

Edmeades, D.C. (1982) Effects of lime on effective cation exchange capacity and exchangeable

• cations on a range of New Zealand soils. New Zealand Journal of Agricultural Research, 25(1): 27–33. DOI: https://doi.org/10.1080/00288233.1982.10423369.

Gouri, D.M., Jagadeesh, S.J.S., Gopinanth, C.R. and Kalibavi, C.M. (2012). Importance of azolla as a

• sustainable feed for livestock and poultry - A review. Agricultural Reviews, 33(2): 93-103. Available online at: http://www.indianjournals.com/ijor.aspx?target=ijor:ar&volume=33&issue=2&article=001 [Accessed on 23 September 2021].

Gunawan, I., Budidaya, J., Pangan, T. and Negeri, P. (2014) Kajian Peningkatan Peran Azolla Sebagai

• Pupuk Organik Kaya Nitrogen pada Padi Sawah(Study Increasing Role of Azolla As Nitrogen Rich Organic Fertilizer on Rice). Jurnal penelitian Pertanian Terapan, 14(2), 134–138. DOI: https://doi.org/10.25181/jppt.v14i2.151

Haryanto, H.R. and Sisworo, E.L. (2008) Azolla sumber nitrogen terbarukan bagi sawah padi (Azolla

• is a renewable nitrogen source for rice fields). Prosiding Simposium dan Pameran Teknologi Aplikasi Isotop dan Radiasi, Jakarta 5-6 August. ISBN: 978-979-3358-12-7. Available online at: http://repo-nkm.batan.go.id/6287/1/2008_00_Cover%20Daftar%20Isi.PDF [Accessed on 02 September 2021].

Herman, T., Murchie, E.H. and Warsi, A.A. (2015). Rice production and climate change: A case study

• of Malaysian rice. Pertanika Journal of Tropical Agricultural Science, 38(3): 321–328. ISSN: 1511-3701. Available online at: http://www.pertanika.upm.edu.my/resources/files/Pertanika%20PAPERS/JTAS%20Vol.%
  2038%20(3)%20Aug.%202015/02%20JTAS%200670-2014%20(Short%20Comm).pdf [Accessed on 21 September 2021].

Hou, W., Tränkner, M., Lu, J., Yan, J., Huang, S., Ren, T., Cong, R. and Li, X. (2020). Diagnosis of

• nitrogen nutrition in rice leaves influenced by potassium levels. Frontiers in Plant Science, 11(February): 1–13. DOI: https://doi.org/10.3389/fpls.2020.00165.

Hou, W., Xue, X., Li, X., Khan, M.R., Yan, J., Ren, T., Cong, R. and Lu, J. (2019). Interactive effects of

• nitrogen and potassium on: Grain yield, nitrogen uptake and nitrogen use efficiency of rice in low potassium fertility soil in China. Field Crops Research, 236: 14–23. DOI: https://doi.org/10.1016/j.fcr.2019.03.006.

Houba, J.J., Lee, van der I., Novozamsky, I. and Walinga, I. (1988). Soil and Plant Analysis. In Plant

• Analysis Manual Dep. Soil Sci. Plant Nutr., Wageningen Agricultural University, the Netherlands. DOI: https://doi.org/10.1007/978-94-011-0203-2.

Hove, C.V.A.N. and Lejeune, A. (1996) Does Azolla have any future in agriculture? The International

• Symposium on Biological Nitrogen Fixation Associated with Rice (Dhaka, Bangladesh, du 28/11/1994 au 02/12/1994). In: Biological Nitrogen Fixation Associated with Rice Production. Dordrecht, The Netherlands: Kluwer Academic Publishers, pp.199683–84.

Jagadish, S.V.K., Craufurd, P.Q. and Wheeler, T.R. (2007). High temperature stress and spikelet

• fertility in rice (Oryza sativa L.). Journal of Experimental Botany, 58(7): 1627–1635. DOI: https://doi.org/10.1093/jxb/erm003.

Kamalasanana, P.P., Premalatha, S. and Rajamony, S. (2002) Azolla-A sustainable feed substitute for

• livestock. Leisa India. Available online at: https://www.slideshare.net/belajarbarengaquaponik/azolla-a-sustainable-feed-substitute-for-livestock [Accessed on 01 September 2021].

Kavitha, G. and Subramaniam, P. (2007) Effect of enriched municipal solid waste compost

• application on growth, plant nutrient uptake and yield of rice. Journal of Agronomy, 4(6): 586–592. DOI: https://doi.org/10.3923/ja.2007.586.592.

Klomklao, P., Kuntinugunetanon, S. and Wongkokua, W. (2017) Moisture content measurement in

• paddy. Siam Physics Congress 2017 (SPC2017) IOP Conf. Series: Journal of Physics: Conf. Series, 901(2017)012068: 1–5. DOI: https://doi.org/10.1088/1742-6596/901/1/012068.

Maftuchah, D., Wahyudi, A., Zainudin, A. and Budiyanto, M.A. (1998) Asosiasi Azolla sp. dengan

• Mikroalga Anabaena azollae Sebagai Sumber Nitrogen Alami dan Pemanfaatannya Sebagai Bahan Baku Protein (Association of Azolla sp. With the microalgae Anabaena azollae as a natural source of nitrogen and its use as protein raw material). Proyek Penelitian Hibah Bersaing VI–Tahun Pertama, DP3M, Direktorat Jenderal Pendidikan Tinggi, Depdiknas.

Manickam, T., Ibrahim, I. Z., Zamir, M., Naim, M., Abdul, F., Rasul, M.A., Zawawi, N.Z., Bakar, N.A.,

• Adzahar, S., Syahidah, N., Sam, M. and Kamaruddin, H. (2020). RiceFERT : Pengurusan baja secara lokasi spesifik untuk tanaman padi di Malaysia (Site-specific steel processing for rice plantations in Malaysia). Buletin Teknologi MARDI, 19: 11–23. Available online at: http://ebuletin.mardi.gov.my/buletin/19/Theeba.pdf [Accessed on 11 September 2021].

Miao, Y., Stewart, B.A. and Zhang, F. (2011). Long-term experiments for sustainable nutrient

• management in China. A review. Agronomy for Sustainable Development, 31(2): 397–414. DOI: https://doi.org/10.1051/agro/2010034.

Muthayya, S., Sugimoto, J.D., Montgomery, S. and Maberly, G.F. (2014). An overview of global rice

• production, supply, trade, and consumption. Annals of the New York Academy of Sciences, 1324(1): 7–14. DOI: https://doi.org/10.1111/nyas.12540.

Nurmayulis, N., Utama, P., Firnia, D., Yani, H. and Citraresmini, A. (2011). Respons Nitrogen dan

• Azolla terhadap Pertumbuhan Tanaman Padi Varietas Mira I dengan Metode SRI (Nitrogen and Azolla Respons on Growth of Rice Plant of Mira-I Variety with SRI Methode). Aplikasi Isotop Dan Radiasi, 7(2): 1907–0322. DOI: http://dx.doi.org/10.17146/jair.2011.7.2.86.

Oyange, W.A., Chemining'wa, G.N., Kanya, J.I. and Njiruh, P.N. (2020). Effect of time of Azolla

• incorporation and inorganic fertilizer application on growth and yield of Basmati rice. African Journal of Agricultural Research, 15(3): 464–472. DOI: https://doi.org/10.5897/ajar2019.14456.

Putri, R.E., Yahya, A., Adam, N.M. and Abd Aziz, S. (2016). Variability of Rice yield with respect to

• crop health. Jurnal Teknologi, 78: 79–85. DOI: https://doi.org/10.11113/jt.v78.7272.

Rahmatika, W. (2009). Pengaruh persentase N (Azolla dan Urea) terhadap hasil tanaman padi serta

• kadar protein dan nitrat pada beras (The effect of the percentage of N (Azolla and urea) on rice yields and protein and nitrate levels in rice). CENDEKIA Edisi: 72–75. Available online at: http://publikasi.uniska-kediri.ac.id/data/cendekia/vol7no4des2009/widyana-cendekiavol7n04des2009.pdf [Accessed on 21 September 2021].

Razavipour, T., Moghaddam, S.S., Doaei, S., Noorhosseini, S.A. and Damalas, C.A. (2018). Azolla

• (Azolla filiculoides) compost improves grain yield of rice (Oryza sativa L.) under different irrigation regimes. Agricultural Water Management, 209: 1–10. DOI: https://doi.org/10.1016/j.agwat.2018.05.020.

Shen, H.F. and Tung, T.C. (1985). Culture of Azolla and rice plants Growth and N2 fixation of Azolla

• plants Growth and yield of rice. Elsevier Science Publishers, 22(22): 145–152.

Singh, P.K., Misra, S.P. and Singh, L. (1984). Azolla biofertilization to increase rice production with

• emphasis on dual cropping. Practical Application of Azolla for Rice Production, 9(12): 132–144. DOI: https://doi.org/10.1007/10201064_17.

Sisworo, E., Rasjid, H., Haryanto, H. and Idawati, I. (2011). The Contribution of Azolla and Urea in

• Lowland Rice Growth Production for Three Consecutive Seasons. Atom Indonesia, 34(1). DOI: https://doi.org/10.17146/aij.2008.87.

Smithson, P.C. and Giller, K.E. (2002). Appropriate farm management practices for alleviating N and

• P deficiencies in low-nutrient soils of the tropics. Plant and Soil, 245(1): 169–180. DOI: https://doi.org/10.1023/A:1020685728547.

Taha, N. and El-Shahat, R. (2017). Influence of Azolla, some Blue Green Algae strains and humic acid

• on soil, growth, productivity, fruit quality and storability of "Canino" Apricot cultivar grown under clay loamy soil. Journal of Plant Production, 8(1): 1–11. DOI: https://doi.org/10.21608/jpp.2017.37461.

Thomas, G.W. (1982). Exchangeable cations. In: A.L. Page, R.H. Miller and D.R. Keeney (eds.),

• Methods of Soil Analysis, Part 2: Chemical and Microbiological Properties. Soil Science Society of America, Madison, Wisconsin, USA, pp.9–11.

Utami, S.N.H., Purwanti, B.H. and Putra, R.C. (2013). Pengaruh Pupuk Kandang Kambing dan Azolla

• terhadap Beberapa Sifat Kimia Tanah dan Serapan N Padi di Sawah Organik Smbirejo, Sragen (Effect of Goat Manure and Azolla on Some Soil Chemical properties and Rice N Uptake in Smbirejo Organic Rice Fields, Sragen). Ilmu Tanah (pp.105–117). Universitas Gadja Mada. Available online at: http://etd.repository.ugm.ac.id/penelitian/detail/62537 [Accessed on 10 September 2021].

Wayayok, A., Gholizadeh, A., Saberioon, M., Vka, L.B. and Soom, M.A.M. (2017). Leaf chlorophyll and

• nitrogen dynamics and their relationship to lowland rice yield for site-specific paddy management. Information Processing in Agriculture, 4(4): 259–268. DOI: https://doi.org/10.1016/j.inpa.2017.08.002.

Yao, Y., Zhang, M., Tian, Y., Zhao, M., Zeng, K., Zhang, B., Zhao, M. and Yin, B. (2018). Azolla

• biofertilizer for improving low nitrogen use efficiency in an intensive rice cropping system. Field Crops Research, 216: 158-164. DOI: https://doi.org/10.1016/j.fcr.2017.11.020.

Ye, T., Li, Y., Zhang, J., Hou, W., Zhou, W., Lu, J., Xing, Y. and Li, X. (2019). Nitrogen, phosphorus, and

• potassium fertilization affects the flowering time of rice (Oryza sativa L.). Global Ecology and Conservation, 20: e00753. DOI: https://doi.org/10.1016/j.gecco.2019.e00753.

Ying, J., Peng, S., He, Q., Yang, H., Yang, C., Visperas, R.M. and Cassman, K.G. (1998). Comparison of

• high-yield rice in tropical and subtropical environments I. Determinants of grain and dry matter yields. Field Crops Research, 57(1): 71–84. DOI: https://doi.org/10.1016/S0378-4290(98)00077-X.

Yoshida, S. (1973). Effects of temperature on growth of the rice plant (Oryza sativa L.) in a

• controlled environment. Soil Science and Plant Nutrition, 19(4): 299–310. DOI: https://doi.org/10.1080/00380768.1973.10432599.

Yoshida, S. (1981). Fundamentals Of Rice Crop Science. In: Plant Production Science. International

• Rice Research Institute, Philippines. Available online at: http://books.irri.org/9711040522_content.pdf [Accessed on 30 September 2021].