Studies on the pasture irrigation vi. effect of irrigation and nitrogen fertilization on grass production nitrate nitrogen concentration and irrigation efficiency by growing season and growth stage

Seo, S.; Lee, J.K.; Lee, S.C.; Park, M.S.

Korean Journal of Animal Science 32(3): 179-183


Accession: 007835882

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For basic understanding on pasture irrigation, an experiment was conducted to determine the effects of irrigation and nitrogen(N) fertilization (200 and 400kg ha-1 y-1) on the seasonal grass dry matter (DM) production, nitrate nitrogen (NO3-N) concentration, and irrigation efficiency in pasture mixtures dominated by orchardgrass, 1988. It was investigated on 7, 14, 21, and 28 days after harvesting in spring(May), summer(July) and autumn (Sept), respectively. During experimental period, rainfall was controlled artificially, and irrigation point was ca. 1.0 bar. Higher DM production was observed in spring (1967 kg ha-1), irrigated plot, and higher N fertilization plot, respectively. Also the DM production was increased with advancing maturity of plants. Irrigation efficiency in spring (20kg ha-1 mm-1) was significantly higher than summer (9kg), especially in high N fertilization plot. On the other hand, the efficiency in summer season was high in low N plot. NO3-N concentration in spring was very low (less than 0.1%), however, the NO3-N was high (more than 0.2%) in summer and autumn. Also the NO3-N was increased remarkably with increasing of N level, and decreased slightly with advancing of plant growth. Based on the results, it is suggested that higher N in spring, and lower N fertilization in summer and autumn are more effective for grass production and irrigation efficiency. Also enough regrowth period is disirable to decline NO3-N in summer and autumn.