Lysimeter study on ground water degradatio due to different fertilization and irrigation management
2000
Popova, Z. | V"rlev, I. | Kutev, V. | Shopova, D. (Institut po Pochvoznanioe i Agroekologiya "N. Pushkarov", Sofia (Bulgaria))
Compared technologies of maize management under uniform and alternative furrow irrigation/fertilization prived that the latter led to 30% reduction of ground water pollution under Chromic Luvisol conditions. Alternative furrow irrigation could save additionally water and facilitate technically large-scale irrigation practice. N-loads to ground water depended on the technology of fertilization and irrigation and range from 7% to 10% of the applied fertilizer. N- loads augment three folds, that is from 14 to 42 kg N/ha, when fertilization rate increases twice from 200 to 400 kg N/ha. Science harvested yield was almost equivalent in all studied lysimeter, it was concluded that application rate higher then 200 kg N/ha should be considered ecologically hazardous and economocally unjustified.
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