Fiziološki in agronomski odziv sort koruze (Zea mays L) na gostoto posevka in defoliacijo po antezi v razmerah vlažnega deževnega gozda

Olalekan Suleiman SAKARIYAWO, Doyin OGUNDIRAN, Paul SOREMI, Sunday ADERIBIGBE

Povzetek


V raziskavi so bile preiskuševane spremembe v odzivih koruze (Zea maysL.) na gostoto posevka in defoliacijo po antezi v razmerah vlažnega deževnega gozda. Izvedena sta bila dva poljska poskusa v Abeokuti (ZD 3025’E, ZŠ 7015’N; 144 m a.s.l) in Ibadanu (3056’E, 7033’N: 168 m a.s.l) v Nigeriji, leta 2015. Poskusi so obsegali sorto koruze {2009 TZE-W DT STR [tujeprašno sorto (OPV)] in hibrid TZEI 124 × TZEI 25} na glavni ploskvi, gostoto posevka (71111, 80000 in 106666 rastlin ha-1) na podploskvah in defoliacijo (+ defoliacijain – defoliacija) na nadaljnih podploskvah. Poskus je bil zasnovan kot popolni naključni bločni poskus z deljenkami s tremi ponovitvami.Tujeprašna sorta (OPV) je imela značilno večjo asimilacijsko površino, večjo fotosintezo, zmanjšano sposobnost translokacije suhe snovi, zmanjšano število dni do 50 % anteze in večjo maso 1000 zrn kot hibridna sorta koruze, a podoben pridelek zrnja. Na obeh lokacijah se je indeks listne površine povečal z gostoto posevka. Zmanjšana masa 1000 zrn na obeh lokacijah v primeru defoliacije nakazuje motnje v ravnovesju med virom in ponorom asimilatov.

Ključne besede


defoliacija; tujeprašna koruza; gostota posevka; velikost fotosinteze; učinkovitost fotosinteze

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2018.111.2.01

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