Sustainable rice cultivation in coastal saline soils: a case study Institute, India

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Yang-yang Li ◽  
Kai Zhao ◽  
Jian-hua Ren ◽  
Yan-ling Ding ◽  
Li-li Wu

Soil salinity is a global problem, especially in developing countries, which affects the environment and productivity of agriculture areas. Salt has a significant effect on the complex dielectric constant of wet soil. However, there is no suitable model to describe the variation in the backscattering coefficient due to changes in soil salinity content. The purpose of this paper is to use backscattering models to understand behaviors of the backscattering coefficient in saline soils based on the analysis of its dielectric constant. The effects of moisture and salinity on the dielectric constant by combined Dobson mixing model and seawater dielectric constant model are analyzed, and the backscattering coefficient is then simulated using the AIEM. Simultaneously, laboratory measurements were performed on ground samples. The frequency effect of the laboratory results was not the same as the simulated results. The frequency dependence of the ionic conductivity of an electrolyte solution is influenced by the ion’s components. Finally, the simulated backscattering coefficients measured from the dielectric constant with the AIEM were analyzed using the extracted backscattering coefficient from the RADARSAT-2 image. The results show that RADARSAT-2 is potentially able to measure soil salinity; however, the mixed pixel problem needs to be more thoroughly considered.


2019 ◽  
Vol 14 (32) ◽  
pp. 1499-1508
Author(s):  
Sanchez Luis ◽  
Melo Valdinar ◽  
Nunes Taline ◽  
Portalanza Diego ◽  
Durigon Angelica ◽  
...  

KALPATARU ◽  
2020 ◽  
Vol 29 (1) ◽  
pp. 39-50
Author(s):  
Ary Sulistyo

Abstract. This research focused on eco-religion of indigenous Sundanese local community of Kasepuhan Ciptagelar at Southern Halimun Mountain on how to manage sustainable environment. The Kampong Cengkuk is one of several kampongs that still follow the tradition of indigenous local community of Kasepuhan Ciptagelar for hundred years. This descriptive qualitative research aims to reveal the internal and external factors led to deforestation of natural forests with average around 6-8% per year. The research shows that the kampong is still practicing eco-religion tradition by protecting forestland (leuweung tutupan) only for their subsistence. The hypothesis is that the social-culture changes had been occurred in the community not only to restrict outer island agriculture in the forest, but also, in wet rice cultivation activities, to manage sustainable environment. The reduction in process and ceremonial activities also happened, which was originally eight ceremonies of outer island agriculture rituals into five ceremonies of wet rice cultivation. The more profane activities were developing economic crops in home garden. Keywords: Ecoreligion, Kampong, Environment, Forest, Tradition   Abstrak. Penelitian ini membahas tentang eko-religi masyarakat lokal Sunda Kampung Ciptagelar di Pegunungan Halimun Selatan bagaimana dalam pengelolaan lingkungan keberlanjutan saat ini. Kampung Cengkuk adalah salah satu dari kampung-kampung pengikut tradisi Kasepuhan Ciptagelar selama ratusan tahun. Penelitian dengan menggunakan pendekatan deskriptif-kualitatif ini yang bertujuan untuk mengetahui faktor dari dalam dan luar kampung penyebab deforestasi hutan alam dengan rata-rata sekitar 6-8% per tahun. Hasil penelitian menunjukkan bahwa praktik ekoreligi masih dianut warga kampung dengan menjaga hutan tutupan (leuweung tutupan) untuk kegiatan subsistensi. Hipotesa yang dibangun adalah perubahan sosio-kultur terjadi pada masyarakat dengan membatasi kegiatan berladang di hutan tetapi lebih kepada kegiatan bertani di sawah ladang untuk mengelola lingkungan berkelanjutan. Pengurangan pada proses dan kegiatan upacara, yang semula delapan upacara daur ladang menjadi lima upacara daur sawah. Kegiatan profan lebih banyak pada pengembangan komoditas tanaman ekonomi di kebun-talun. Kata kunci: Ekoreligi, Kampung, Lingkungan, Hutan, Tradisi


2018 ◽  
Vol 54 (2A) ◽  
pp. 91
Author(s):  
Duong Mai Linh

Rice cultivation causes the emission of CH4 consequenced to the global warming. Reduction of irrigation in rice cultivation is not only saving water resources but also reducing greenhouse gases emission. The objectives of this study was to determine impacts of water management on the emission of CH4 and rice yield. Experiment was conducted in field conditions in An Giang province, Viet Nam with three treatments as continuous flooding (CF), An Giang Alternative Wetting and Drying (AAWD) which is mostly applied by farmers in An Giang province-Viet Nam, and Alternate Wetting and Drying (AWD). Water levels in the field +5 cm, ± 5 cm and -15 cm were controlled higher, fluctuated and lower than soil surface, respectively for CF, AAWD and AWD. CH4 emission determined every week during 13 weeks of the experiment. Rice yield was determined in 1 m2 at the end of the experiment. The results showed that AWD and AAWD, respectively decreased 78.7 % (p < 0.05) and 6.8 % (p > 0.05) CH4 emission compared to the CF 11.9 mg CH4/m2/h. The rice yield of CF was 6.32 ton/ha lower than AAWD 7.8 ton/ha (p < 0.05) but not different with AWD 6.67 ton/ha. AAWD had higher rice yield but same emission than the CF. Farmers in An Giang province should consider application of AWD in rice cultivation in term of saving water and reduction of CH4 emission.


2020 ◽  
Vol 857 ◽  
pp. 349-357
Author(s):  
Taha Yaseen Abdulnabi ◽  
Nidhal Hadi Salman ◽  
Ban Kasim

Road specialists in the world often suffer the huge challenge in designing a stable road on very soft saline soils, these soils in arid zones have a low bearing capacity with high compressibility and very sensitive to moisture and synchronized with complete collapse. The case study concerned by the deterioration of main road linking between ‎Alsamawa town and Sawa lake approximately 20 km away from Alsamawa town. There are sections of roads affected by converges of nearby local artificial ‎lakes , water drawn from several good drain down to (80) meters depths and causing the deterioration in the road sections , swell-collapse test results represented by a little swell potential values were appeared for zero applied stress, while aggressive collapse were happened with increasing in applied stress, and the increasing in degree of collapsibility corresponding to increasing of applied stress of (50,100,200) KPa, and sodium chloride (NaCl%) in soil layers range between (0.613-16.468) % and slightly to moderately gypseous soils, the case study included several recommendations to treating the deteriorated significantly of road to protect the sub-grade and subbase layer .


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