Effects of interaction of phosphorus (P) application in soil and leaves on root, nodule characteristics and nitrogen (N) metabolism in peanut
(2.Shandong Peanut Research Institute, Qingdao, Shandong 266100)
(3.Yantai Academy of Agricultural Sciences, Yantai, Shandong 265500)
(4.Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008)
【Abstract】Spraying P fertilizer is an important supplement for applying P fertilizer in soil. A pot experiment with nutrient solution was conducted to study the effect of foliar fertilizer with different P concentrations on peanut root morphology, nodule characteristics, leaf N metabolic enzymes and dry weight of plant under adequate and stress P conditions, respectively. At pod-setting and -fulling stages, spraying P fertilizer improved growth of root and nodule, and enhanced activities of N metabolic enzymes in leaves. The increment of each parameter under P 0.2% treatment was larger than that under P 0.1% treatment. At harvest stage, relevant parameters of peanut root, nodule and N metabolism in P 0.2% treatment were lower than those in P 0.1% treatment with adequate soil P. High foliar P fertilizer resulted in senescence of plant. Spraying P fertilizer could improve the parameters mentioned above under soil P stress condition. The parameters of P 0.2% treatment were equal to or a little higher than those of P 0.1% treatment. Foliar P fertilizer increased N, P accumulation and dry weight of different organs. Under adequate soil P condition, the increments of pod N, P accumulation and dry weight in P 0.1% treatment were larger than those in P 0.2% treatment, and the responses of the parameters in others organs (root, stem, leaf and peg) to foliar P fertilizer were adverse. Under P stress condition, the parameters increased with the increase in foliar P level. The yield increase caused by spraying P fertilizer was because of the improvement of pod number per plant. In conclusion, the suitable foliar P concentrations under adequate soil P and stress conditions were 0.1% and 0.2%, respectively. In peanut production, we should choose suitable content of foliar P fertilizer according to soil P level.
【Keywords】 foliar P fertilizer; root morphology; nodule characteristics; N metabolism; nutrient uptake;
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