The effect of catch crop nitrogen on soil properties and spring barley yield
2008
Arlauskiene, A., Lithuanian Inst. of Agriculture, Joniskelis, Pasvalys reg. (Lithuania). Joniskelis Experimental Station | Maiksteniene, S., Lithuanian Inst. of Agriculture, Joniskelis, Pasvalys reg. (Lithuania). Joniskelis Experimental Station
During the period 2001-2004 field experiments were carried out at the Lithuanian Institute of Agriculture's Joniskelis Experimental Station on clay loam soil. The experiments were designed to elucidate the mobilization of soil nitrogen by the catch crops oil radish (Raphanus sativus L.), white mustard (Sinapis alba L.), red clover (Trifolium pratense L.), cocksfoot (Dactylis glomerata L.), Italian ryegrass (Lolium multiflorum Lamk.) and their subsequent effect on soil organic carbon and the spring barley grain yield. The ranking among the different catch crops according to nitrogen content in biomass was: red clover white mustard oil radish = cocksfoot Italian ryegrass. The N2 fixation rate of red clover was 128 kg haE-1. The averaged data of the experiments indicate that with increasing root and overground plant mass the C to N ratio widened (r=0.66, r=0.68; P≤0.05 respectively) and the fibre content increased (r= 0.59, r= 0.69; P≤0.05). Experimental evidence suggests that having incorporated the biomass of various crops (with C:N ratio = 17.0-25.7) - oil radish, white mustard and red clover at flowering the stage and that of cocksfoot and Italian ryegrass at the heading stage, the content of soil organic carbon in the soil increased (4.0-5.6 %). The legume catch crops biomass ploughed in as green manure significantly increased the spring barley yield.
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