A study of the quality factors affecting the short-term decomposition of field vegetable residues

摘要: Experiments were carried out to characterise the composition and decomposition of 13 vegetable crop residues. There was a considerable range composition, with 55% dry matter being water-soluble in onion compared only 15% wheat. The carbon/nitrogen ratio crops narrow, between 9 24, C/N 58 residues could be described by single-exponential equation Y = a + be−k(t − d), where Y is proportion residue remaining at any thermal time day degrees above 0 °C, end experiment, b corresponding degradable fraction, k rate constant for process d delay factor (in units time) which delays start process. Y, are all expressed as percentages on weight basis and, definition, a + b must equal 100 t  = 0. value assumed zero except those from leafy brassicas, it set 100. half-life ranged 145 day deg over 1400 day deg (k) related C N contents (r  = 0.84, p  = 0.001), parameter crop's lignin content (r  = 0.74, p  = 0.004).