Effects of Combined Potassium and Organic Fertilizer Application on Newhall Navel Orange Nutrient Uptake, Yield, and Quality

In this study, we investigated the effects of combined application different doses potassium and organic fertilizers on nutrient uptake, yield, quality Newhall navel oranges (Citrus sinensis Osb. cv.). The citrus trees were treated with fertilizer alone or one three combinations fertilizers. Spring shoots, autumn fruit collected when they reached maturity, relevant indexes determined by conventional methods. soil carbon flux was measured 15, 35, 65, 95 days after a gas measuring instrument. results showed that dry weights leaves twigs spring shoots 43.1% 99.8% higher in OM15+K05-treated (15 kg manure 1.05 sulfate per plant) than OM0+K25-treated (1.25 plants, respectively. Combined helped fruits to absorb more mineral nutrients. As result, yield increased, surface color improved, skin thickness became thinner. internal also improved combination optimal for OM10+K15-treated plants. recommended orange orchards purple paddy southwestern China are 5–10 kg/plant 1.15–1.20 kg/plant,