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<p class="teks">ABSTRACT<br /><br />Most salt-affected agricultural land has low productivity such that suitable management is required to improve the productivity. Negative effect of salinity stress can be reduced by growing salt-tolerant cultivars and soil amelioration. The objective of the research was to identify effective ameliorant and effect of mulching in improving soybean growth and yield on saline soil. The research was conducted on saline soil in Lamongan District that has electrical conductivity (EC) of  11.39 dS m-1 during dry season 2016. Treatments consists of two factors that were arranged in split plot design, and replicated three times. The main plot was mulching, i.e. without mulching and mulching with 3.5 ton ha-1 rice straw. The subplots were six amelioration traits, namely without amelioration (control), 120 kg ha-1 K2O, 750 kg ha-1 S, 5 ton ha-1 gypsum, 5 ton ha-1 manure and combination of 5 ton ha-1 manure+1.5 ton ha-1 gypsum. The soybean seed used was K-13, a saline tolerant genotipe. The results showed that mulching reduced soil EC, increased K and Ca absorption, leaf chlorophyll index, improved growth and yield. Soil amelioration with K2O, sulphur, gypsum, or combination of manure+gypsum decreased soil EC and soil pH.  Amelioration with gypsum increased the grain yield of 36.3%. <br /><br />Keywords: EC, leaf chlorophyl index, salinity stress, soil management <br /><br /></p>

Gypsum and cow manure potential as ameliorant to increase crop production under salt stress or saline condition. This research aimed to learn the effect of gypsum and cow manure on the uptake of Na, K and the yield of soybean genotypes under saline condition. This research conducted in green house Jatikerto Experimental Farm Faculty of Agriculture, Brawijaya University, from June to September 2014. The research was arranged in a split plot design. The main plot was soybean genotypes consists of two saline susceptible varieties (G1 = Wilis and G2 = Tanggamus) and two saline tolerant genotypes (G3 = genotype IAC, 100/Bur//Malabar and G4 = genotype Argopuro//IAC, 100); sub plot was ameliorant application consists of A0 = without ameliorant; A1 = cow manure (20 t/ha); and A2 = gypsum (5 t/ha). The results of the research showed that Leaf Chlorophyll Index in susceptible varieties and tolerant genotypes were increased with ameliorant application. Accumulation of proline and K/Na ratio in susceptible varieties higher than tolerant genotypes. Ameliorant application on tolerant genotypes increased grain yield higher than susceptible varieties.

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