A Model of Evapotranspirative Irrigation to Manage the Various Water Levels in the System of Rice Intensification (SRI) and Its Effect on Crop and Water Productivities

Evapotranspirative irrigation is a simple idea in a watering field based on the actual evapotranspiration rate, by operating an automatic floating valve in the inlet without electric power to manage water levels. The current study introduces a model of evapotranspirative irrigation and its application under different water levels. The objectives were (1) to evaluate the performances of evapotranspirative irrigation under various irrigation regimes, and to (2) to observe crop and water productivities of the system of rice intensification (SRI) as affected by different types of irrigation. The experiment was performed during one rice planting season, starting from July to November 2020, with three irrigation regimes, i.e., continuous flooded (CFI), moderate flooded (MFI) and water-saving irrigation (WSI). Good performance of the system was achieved; low root mean square error (RMSE) was indicated between observed water level and the set point in all irrigation regimes. Developing a better drainage system can improve the system. Among the regimes, the WSI regime was most effective in water use. It was able to increase water productivity by up to 14.5% while maintaining the crop yield. In addition, it has the highest water-use efficiency index. The index was 34% and 52% higher than those of the MFI and CFI regimes, respectively. Accordingly, the evapotranspirative irrigation was effective in controlling various water levels, and we recommend the system implemented at the field levels.

Productivity and economics of rice cultivars under different irrigation regimes and systems of cultivation

Shortage of water in rice cultivation is major problem in India. To safeguard and sustain food security in India, it is quite important to increase the productivity of rice under limited water resources. To investigate the performance of rice cultivars under the best method of irrigation and system of cultivation in new condition an experiment was conducted to study the "productivity and water use efficiency of rice (Oryza sativa L.) cultivars under different irrigation regimes and systems of cultivation" on clay loam soils of Indian Institute of Rice Research (IIRR), Rajendranagar, Hyderabad, Telangana during the kharif seasons of 2017 and 2018. The treatment comprised of two irrigation regimes viz., AWD and saturation as main plot treatments, three establishment methods viz., system of rice intensification, drum seeding and TP as subplot treatments and four cultivars namely DRR Dhan 42, DRR Dhan 43, MTU-1010 and NLR-34449 as sub-sub plot treatments summing up to 24 treatment combinations laid out in split-split plot design with three replications. Among the irrigation regimes, AWD irrigation practice recorded higher grain yield (5755, 5952 and 5854 kg ha-1 in 2017, 2018 and pooled means, respectively) than saturation. Among the different systems of cultivation, the SRI recorded significantly higher grain yield (5953, 6129 and 6041 kg ha-1 during 2017, 2018 and in pooled means, respectively) over the TP method. Among the different rice cultivars, DRR Dhan 43 registered remarkably higher grain yield than other cultivars during 2017 and 2018.

Performance of Two Rice (Oryza sativa L.) Genotypes Under Modern and Conventional Farming Methods in Three Locations in Iraq

The conservation of natural resources like soil and water and reduces chemical pollution in the environment is the desired goal of the directions of improving the performance of important crops for meeting the global food demand. However,System of Rice Intensification (SRI), is a rice cropping system that is consistent with Conservation Agricultural (CA) and Sustainable Agriculture (SA). The current study was aimed to investigate the effects of SRI method on grain yield and its components in two rice varieties compared with conventional practice in farmers' fields (CFM) in different environmental conditions in Iraq. The study was conducted in the fields during the rice season 2019 in three provinces in the south of Iraq (Najaf, Diwaniya and Muthanna). Anber33 and Jasmine rice varieties were grown in each location and the traits were conducted at sites having 2 donum of land (5,000 m2).The trial was performed as a factorial experiment based on a randomized complete blocks design (RCBD) having three blocks. The results showed superior significant of SRI method compared to CFM method in traits (plant height and panicle length, number per panicle, and percentage of unfilled grains). Furthermore, SRI method gave higher grain yield as a percentage with both varieties in each province (25.6% in Muthanna, 24.5% in Najaf, and 13.2% in Diwaniya province) compared to CFM. However, grain yield in Jasmine variety was higher than on Anber33 approximately 50% in three locations in this study. Overall, our results suggest that SRI method is the most convenient method in Iraq conditions due to the increased grain yield in rice compared to the CFM method.

Performance of Two Rice (Oryza Sativa L.) Genotypes Under SRI and Conventional Farming Methods in Three Locations in Iraq

The conservation of natural resources like soil and water and reduces chemical pollution in the environment is the desired goal of the directions of improving the performance of important crops that to meet the global food demand. However System of Rice Intensification (SRI), is a rice cropping system that is consistent with Conservation Agricultural (CA) and Sustainable Agriculture (SA). The current study was aimed to investigate the effects of SRI method on grain yield and its components in two rice varieties compared with conventional practice in farmers' fields (CFM) in different environmental conditions in Iraq. Study was conducted in the fields during the rice season 2019 in three provinces in south of Iraq (Najaf, Diwaniya and Muthanna ). Anber33 and Jasmine rice varieties were grown in each location and the traits were conducted at sites having two donum of land (5,000 m2). The trial was performed as factorial expriments based on a randomized complete blocks design (RCBD) having three blocks. The results showed superior significant of SRI method compared to CFM method in traits (plant height and panicle length, number per panicle and percentage of unfilled grains). Furthermore, SRI method gave higher grain yield as percentage with both varieties in each province (25.6% in at Muthanna, 24.5% in Najaf and 13.2% in Diwaniya province) compared to CFM. However, grain yield in Jasmine variety was higher than on Anber33 approximately 50% in three locations in this study. Overall, our results suggest that SRI method is the most convenient method in Iraq conditions due to the increased grain yield in rice compared to the CFM method.

An Economic Analysis of Paddy Cultivation in Cuddalore District

In this paper an attempt was made to analyze economics of paddy cultivation in Cuddalore district. Based on area under paddy, three blocks namely Kurinjipadi, Kumaratchi and Vridhachalam were selected. The total sample size was 120 paddy growers. The study revealed that area and production of paddy crop was declining during the period 1998-2008 while the productivity was growing positively during the same period. During 2009-2019, compound growth rate of area, production and productivity of paddy was depicting an increasing trend due to the role-played by high yielding varieties which created greater affinity towards paddy crop. The cost of production of paddy per hectare was estimated to be Rs. 56,617. The average gross income was found to be Rs. 92,077 per hectare and net income was observed to be Rs. 29,712 per hectare. Excessive usage of nitrogen and phosphorous fertilizers could be reduced to decrease the production cost and increase the efficiency of inputs. Adoption of System of Rice Intensification (SRI) method was suggested to increase the productivity of paddy.

Pertumbuhan dan Hasil Tanaman Padi (Oryza sativa L.) pada Berbagai Sistem Tanam di Kampung Desay, Distrik Prafi, Kabupaten Manokwari

Padi merupakan kebutuhan primer bagi masyarakat Indonesia, karena sebagai sumber energi dan karbohidrat bagi mereka. Penurunan produksi beras dapat mempengaruhi ketersediaan pangan. Salah satu faktor yang mempengaruhi produksi padi adalah sistem tanam. Tujuan penelitian ini yaitu untuk mengetahui sistem tanam terbaik untuk pertumbuhan dan produksi tanam padi serta memberikan pengetahuan kepada petani tentang sistem tanam padi yang efektif. Penelitian dilaksanakan di Kampung Desay, Distrik Prafi, Kabupaten Manokwari. Selama 5 bulan, mulai tanggal 1 Desember 2020 - 30 April 2021. Metode yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok Lengkap (RAKL) nonfaktorial dengan 5 perlakuan dan 5 kali ulangan. Perlakuan yang diujikan ialah sistem tanam konvensional, Sistem tanam Jajar Legowo dan Sistem Tanam System of Rice Intensification. Parameter yang diamati yaitu tingkat kesuburan tanah, tinggi tanaman, jumlah anakan, jumlah malai padi dan berat gabah kering panen serta berat gabah kering giling. Terdapat pengaruh antara setiap sistem tanam terhadap tinggi tanaman, jumlah anakkan dan jumlah malai padi, namun tidak memberikan pengaruh yang nyata terhadap produksi gabah kering panen dan gabah kering giling. Sistem tanam terbaik di tunjukan oleh sistem tanam jajar legowo 4:1 dengan hasil mencapai 5,63 ton/ha gabah kering giling. Penggunaan sistem tanam jajar legowo menghasilkan produksi padi lebih tinggi sehingga dapat diterapkan untuk meningkatkan produksi padi. Sedangkan untuk pertanian berkelanjutan penggunaan sistem tanam SRI dapat digunakan karena menerapkan konsep organik dan berkelanjutan.

Yield and Commercialisation Effects of SRI Interventions in Mngeta, Kilombero District, Tanzania

This paper discusses System of Rice Intensification (SRI) interventions and its potential effects on paddy yield and commercialisation in Mngeta division, Kilombero district in Morogoro region, Tanzania. SRI is an innovative agroecological methodology that aims to improve yields and farmers’ profits by creating the most suitable environment for the rice plant to grow. It comprises the precise set of cultivation practices specifically required for careful management of biophysical needs of the rice plant for producing high yields. To assess the effects, we compare between trained and non-trained farmers, as well as between farmers who are members of SRI associations and non-SRI members, on aspects of adoption of SRI interventions, paddy productivity and yields. In turn, the effects of SRI is evaluated in terms of its influence on rice yield per hectare and commercialisation at household level.