Influence of fertil ization and irrigation on nitrogen percolation leaching in black soil region
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Abstract:
In o rder t o clarify the r ea lit ies of nitr og en leakage in paddy so il in black soil a rea o f No rtheast China and to under stand nitro gen mig ration patt ern, a dist rict ex per iment al was dev eloped in ty pical black district based on farmland w ater balance, so as to contr ol the nit rog en leakag e and r educe g roundw ater pollution threat. T he three nitro gen co ncentration chang es in leakag e water of paddy so il under different ir rigation and nit rog en level conditio ns w ere analyzed, and the to tal amo unt of nitr og en leac2 hing in different treatment was calculated using the w ater balance equat ion. Result s show ed that the co ncentrat ions o f ammoni2 um nitro gen, nitr ate nitrog en and to tal nitr og en in the leaching water w ere positively co rr elated wit h nitr og en applicatio n a2 mo unt. Co nt ro l ir rigation and wet2shallow irr igat ion can r educe 11. 89% and 14. 15% of nit rate leakage co ncentration, respec2 t ively. Nitr ogen leaching amount incr eased 0. 117 5 kg per hectare with each addit ional kilo g ram o f nitr og en ( conv er ted into pur e nitro gen) w hen using normal ir rigation, it w as r espectiv ely 0. 035 9 kg and 0. 055 7 kg for contr ol irr igation and w et2shallow ir2 rig atio n. The nitro gen leaching loss in w ho le g row th per iod under contr ol irrigation w as the least, av erag e at 4. 51 kg # hm22 , and it is r espectiv ely 1/ 3 and 1/ 2 of that under no rmal irr ig ation and w et2shallow ir rig atio n. Wet2shallow ir rig atio n w as mo re appli2 cable, and the most reasonable theor etic fertilizer amo unt is 137. 30 kg # hm22 .
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