Abstract
Assessment adaptation of several new superior rice varieties on new rice fields affected by seawater intrusion was carried out in Tungkal Ilir Subdistrict, West Tanjung Jabung District, from April to October 2018. The study applied randomized block designs (RBD) with four replications. The treatments consisted of four new rice high yielding varities suitable for tidal/swamps areas namely Inpara 3, Inpara 8, Inpara 9, and Inpari 34 Salin Agritan, and one local rice variety (Londo) as control. Three stems seedlings per clump were planted at the age of 21-25 days, using a 4:1 Legowo planting system. Fertilizer application consisted of basic fertilizer (1.0 Mg ha-1 of lime, 2.5 Mg ha-1 of manure, and 75 kg ha-1 of urea) and supplementary fertilizer (SP-36 150 kg ha-1 and KCl 125 kg ha-1),. Urea supplementation is given based on observations with a leaf color chart (LCC). The results of the study showed that the four new rice HYVs were more adapted as compared to the local rice variety. The performance of the tested new rice HYVs showed quite a good growth appearance and productivity. The highest production was obtained in Inpari 34 Salin Agritan variety 2.85 Mg ha-1, while Inpara 3, Inpara 8, and Inpara 9 ranged between 2.0 and 2.1 Mg ha-1, while the local variety’s productivity was 1.9 Mg ha-1.
Highlights
Degradation of agricultural land in Indonesia due to salinization has become one of the nationalJ Trop Soils, Vol 25, No 3, 2020: 119-126 ISSN 0852-257X ; E-ISSN 2086-6682 issues (Las et al 2006)
Agricultural land that is affected by seawater intrusion can reach up to 20 km from the coastline (Erfandi et al 2011)
The new open paddy land in Sungai Nibung Village, Tungkal Ilir District, West Tanjung Jabung District can be categorized as saline land, where the value of ECe is 4.18 dS m-1 (Table 1)
Summary
Degradation of agricultural land in Indonesia due to salinization has become one of the nationalJ Trop Soils, Vol 25, No 3, 2020: 119-126 ISSN 0852-257X ; E-ISSN 2086-6682 issues (Las et al 2006). Degradation of agricultural land in Indonesia due to salinization has become one of the national. Land salinity increases due to intrusion of seawater through channels, streams, or swamps. BB Saidi et al.: New Rice on New Constructed Irrigated Rice Field agricultural lands that are saline. The 2004 tsunami in Aceh increased land salinity (ECe 2-40 dS m-1) which damaged more than 120,000 ha of agricultural land (Rachman et al 2008). The effect of salinity on agricultural land was considered a serious threat to global food supply and in the future. One of the measurable indications in determining a land experiencing a threat and potential salinity was the value of electrical conductivity (EC) of land and irrigation water. The soil has experienced salinity if soil ECe value> 4 dS m-1 (FAO 2005)
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