标题：EFFECT OF WATER AND POTASSIUM COUPLING ON EVAPORATION, TRANSPIRATION, PHOTOSYNTHETIC CHARACTERISTIC, WATER PRODUCTION EFFICIENCY AND YIELD OF 'YUNYAN 85' {NICOTIANA TABACUML. 85)
摘要：Soil water and fertilizer had interacted effects on plant growth, evaporation, transpiration, water production efficiency. In this study, three soil water control treatments were set as 50%-70%-60% (W1, ratios of field moisture capacity at rooting period-vigorous growing period-mature period), 60%-80%-70% (W2), 70%-90%-80% (w 3). Each water control interacted with four potassium (K) usages (K1: 0 g/plant, K2:10.0 g/plant， K3:15.0 g/plant， K4:20.0 g/plant) to plant flue-cured tobacco Yunyan85 (N icotiana tabacum L. 85). Soil water content (5), air temperature (7), relative humidity (RH ), some photosynthetic indexes (Pn, Gs, Tr, LWUE), biomass yield ( Y), water use efficiency ( L ), irrigation water use efficiency (IW UE ), unit output value ( UOV), conditions of evaportranspiration were analyzed to study wa- ter-K coupling effects. Results showed that tobacco soil moisture content fluctuated and gradually reduced as tobacco growing. An significant influence presented between SW and soil evaporation (p<0.05 ). T was the greatest factor leading to soil evaporation, while R H and SW decreased water lose. T7 and RH obviously effected soil evaporation especially at the vigorous and mature growth stages. K application to some extend adjusted water demand for tobacco growth. Wa- ter-K coupling treatments significantly advanced tobacco photosynthesis (p<0.05 ). The reasonable usage of water and K fertilizer would reduce irrigation quantity and crop water requirement, augmenting WUE, IW UE , Pn, Gs, Tr, C i, LW UE , Y and UOV (p<0.05 ) at each growing stage. To sum up, water-K treatment of W3K4 at 70%-90%-80%-20.0 would be the best water and potassium interacting management for Yunyan 85 production.
