研究了灌溉,植距和其它有关因素对小粒种咖啡的产量和生长的影响,有效辐射通量是影响产量的主要因素。在五月份(雨季),树冠顶部的光合有效辐射通量受灌溉和咖啡密度的影响较小,而灌溉植株中下层树冠的光合有效辐射量小得多,咖啡密度增加,其通量显著下降。九月份(旱季),灌溉对光合有效辐射通量的影响较少,但在密植 The effects of irrigation, planting distance and other related factors on the yield and growth of small-grain coffee were studied. The effective radiation flux was the main factor affecting the yield. In May (rainy season), the photosynthetically available radiative fluxes at the top of the canopy were less affected by irrigation and coffee density, while photosynthetically available radiation was much lower in the middle and lower canopy layers of irrigated plants, with increased coffee density and significantly lower flux. In September (dry season), irrigation had less effect on photosynthetically active radiation flux but in close planting