Influence Of Different Nitrogen Forms On Growth And Phosphorus Uptake Of Oat

The solution culture and sand culture in controlled condition were conducted in order to investigate the influence of NH4+-N and NO3--N and their different supply ratios on plant growth, amino acid content as well as phosphorus uptake in oat .The obtained results showed that:â‘ When supplied with both N forms ,the oat growth was obviously better than when NH4+-N or NO3--N was the sole nitrogen source ,and 30:70 was the best NH4+/ NO3- ratio for plant growth ;â‘¡When served with constant (3mmol/L) nitrogen ,amino acid content in oat showed increasing trend and along with increase of NH4+-N in cultural medium ,and there was the highest summon amino acid content when NH4+/ NO3- was 70:30 ;â‘¢The increasing of nitrate ' s ratio in nutrient solution had benefit for the activity of nitrate reductase (NR) ,but increasing of NH4+-N in nutrient solution led to the decrease of K+ Ca2+ Mg2+content , the increasing of N ,P ,Fe & Zn contents ,and there wasn' t influence on Mn, Na contents . â‘£ Sand culture showed ,the nitrogen form effected the rhizosphere environment greatly .The pH value of cultural medium was decreased with increasing NH4+-N in nutrient solution ,resulted in the increase of phosphorus uptake .The results could be theoretical fundament for optimizing fertilization in oat production .