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Repce gyokerfelszíni foszfataz-aktivitasanak es foszfortartalmanak alakulasa a talaj foszfattartalom valtozasaval


, : Repce gyokerfelszíni foszfataz-aktivitasanak es foszfortartalmanak alakulasa a talaj foszfattartalom valtozasaval.

A foszfor a n v nyek n lk l zhetetlen t peleme, struktur lis elem, s n lk l zhetetlen az energiatranszform ci ban. A foszfat z enzimek szerepe a P-anyagcser hez k thet?en az lettani folyamatokban sz lesk r?. A n v nyek foszf tfelv tel ben kiemelked? jelent?s g? a n v nyi gy k r fel let n kiv lasztott foszfat z enzim, melynek aktivit sa sz mos t nyez?t?l f gg, gy a n v ny k rnyezeti t nyez?kre adott v laszreakci it l, a n v ny faj t l, fajt j t l, kor t l. A repce P-tartalm nak alakul s t s a gy k rfelsz ni foszfat z-aktivit s t vizsg ltuk Nagyh cs k n, m szleped kes csernozjom talajon be ll tott k s rletben, melyben a kontrollal egy tt hat tr gyakezel st alkalmaztunk. A vizsg lt N- s P-adagok a k vetkez?k voltak: N: s 1 kg ha-1, P2O5: , 1 s 2 kg ha-1. A mint z st a vir gz s kezdet n v gezt k, a gy k r s a hajt s nedvess g- s P-tartalm nak meghat roz s n t l m rt k a gy k rfelsz n savas foszfat z-aktivit s t, valamint a talaj AL-P2O5-tartalm t.Az eredm nyek egy rtelm?en igazolt k a hajt sok gy k rn l nagyobb P-tartalm t, a P-tr gy k n v nyi P-tartalmat, els?dlegesen a gy k r P-tartalm t n vel? hat s t. A N-tr gy z s minden esetben a hajt s P-tartalom cs kken s t eredm nyezte, a s 1 kg ha-1 P2O5-adagn l megb zhat k l nbs ggel.Vizsg lataink alapj n kimutattuk, hogy a gy k r nedvess gtartalma a foszfat z-aktivit ssal szoros pozit v line ris korrel ci t mutat, s az sszef gg s nemcsak a sz raz, hanem a friss gy k rt megre vet tett foszfat z-aktivit sn l is meg llap that . A foszfat z-aktivit s a tr gy z s hat s ra m sodfok polinommal k zel thet?en a 25 26 mg P2O5 kg-1 szintig n?tt, azaz a n v nyek jobb foszf tfelv teli lehet?-s ge stimul l hat s volt, s csak a legnagyobb P-adag j rt enyhe enzimaktivit scs kken ssel. Eredm nyeink alapj n teh t, az irodalmi adatokkal ellent tesen, a foszforadagol s gy k rfoszfat z-aktivit st serkent? hat s t tudtuk kimutatni. A N-adagol s n velte a repcegy k r foszfat z-aktivit s t, azonban hat sa egymag ban nem volt szignifik ns, s ugyancsak korl tozottan, csak egyetlen kezel sben okozott a gy k rvastags g megb zhat enzimaktivit s-k l bs get.Vizsg lataink alapj n a hajt st meg P-mennyis ge egy rtelm?en pozit v korrel ci t mutatott a gy k r foszfat z-aktivit s val, teh t a foszfat z-aktivit s a vir gz s kezdet n lev? repce foszforfelv tel t j l jellemezte. Eredm ny nk c folni l tszik azt a felt telez st, mely szerint j P-ell t sn l a gy k r foszfat z-aktivit sa s a n v nyi P-felv tel kapcsolata a szerves foszforform k jelent?s g nek cs kken se miatt nem igazolhat .

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