Organic acids in a flooded soil receiving added rice straw and their effect on the growth of rice

Effects of Temperature, Water Regime, Light, and Soil Properties on 15N2 Fixation Associated with Decomposition of Organic Matter in Paddy Soils

“…At 15ºC, CH 4 formation was very low for cellulose, probably because of the limited amount of electron acceptors and methanogenic biomass associated with the lower temperature 3,7 . The relatively high ratio of 15 N 2 fixed/(CO 2 +CH 4 ) at low temperatures in the presence of cellulose may be ascribed to a higher availability of substrates for N 2 fixation, such as volatile fatty acids and alcohols, because the accumulation of these intermediate products from the decomposition of cellulosic substrates increased at low temperatures due to the limited level of methane formation 4,16 .…”

“…Our previous observations in fields 9,18 suggested the importance of BNF for the enrichment of soil N along with the decomposition of rice straw and cellulose in the Tohoku region, which is one of the major rice-producing areas of Japan under cool temperate conditions. Many soil factors are known to affect the BNF activity in paddy soils such as the contents of available-P, NH 4 , pH, and redox potential 2,10,12,17 . Soil management related to the application of N, P and organic matter considerably affected N enrichment in fields 9,18 .…”

Establishment of Rice Seedlings by Direct Sowing of Multiple Seed Pellets on Paddy Soil Covered with Legume Living Mulch

“…In some studies, organic matter application promoted the release of organic acids from straw and green manure (Motomura, 1961(Motomura, , 1962Gotoh and Onikura, 1971) and from organic waste in flooded soils (Ueno and Suzuki, 2005). Moreover, organic acids inhibited the root growth of rice (Takijima et al, 1960).…”

Effect of Incorporation Time of Groundnut Residue on Succeeding Rice Crop

“…A number of earlier workers reported that anaerobic decomposition of organic residues produced volatile fatty acids and phenolics (Pareek, 1976;Tsutsuki, 1983;Lynch, 1977). Gotoh and Onikura (1971) reported that in wormer period straw decomposes rapidly and the acids disappear quickly. In Bangladesh the temperature is very high in the month of May which helped to decompose the groundnut residues earlier.…”