Intercepted solar radiation by maize crops subjected to different tillage systems and water availability levels

Pesquisa Agropecuária Brasileira

Homero Bergamaschi²  Genei Antonio Dalmago¹  João Ito Bergonci¹  Cleusa Adriane Menegassi Bianchi Krüger¹  Bruna Maria Machado Heckler¹  Flavia Comiran¹ 

[1] ,Universidade Federal do Rio Grande do Sul Faculdade de Agronomia Porto Alegre RS ,Brazil

关键词: Zea mays;    leaf area;    no-tillage;    photosynthetic photon flux density;    water deficit;    Zea mays;    área foliar;    plantio direto;    radiação fotossinteticamente ativa;    deficit hídrico;   

DOI  :  10.1590/S0100-204X2010001200001

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate changes in the photosynthetic photon flux density (PPFD) interception efficiency and PPFD extinction coefficient for maize crop subjected to different soil tillage systems and water availability levels. Crops were subjected to no-tillage and conventional tillage systems combined with full irrigation and non-irrigation treatments. Continuous measurements of transmitted PPFD on the soil surface and incoming PPFD over the canopy were taken throughout the crop cycle. Leaf area index and soil water potential were also measured during the whole period. Considering a mean value over the maize cycle, intercepted PPFD was higher in the conventional tillage than in the no-tillage system. During the initial stages of plants, intercepted PPFD in the conventional tillage was double the PPFD interception in the no-tillage treatment. However, those differences were reduced up to the maximum leaf area index, close to tasseling stage. The lowest interception of PPFD occurred in the conventional tillage during the reproductive period, as leaf senescence progressed. Over the entire crop cycle, the interception of PPFD by the non-irrigated plants was about 20% lower than by the irrigated plants. The no-tillage system reduced the extinction coefficient for PPFD, which may have allowed a higher penetration of solar radiation into the canopy

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