Effects of Ca fertilizer application on Ca absorption and accumulation of peanut in acid soil
In order to investigate the effects of calcium application on dry matter and calcium nutritional of peanut in different soils,pot experiments were carried out in calcium-deficient acidified red soil and calcium suffi-cient brown soil respectively.The effects of calcium application(CaO 600 kg·hm-2)on the agronomic characteris-tics,dry matter and calcium absorption,distribution and utilization of peanut in different soils were studied with no calcium application as control.The results showed that calcium application in the red soil could increase the num-ber of branches and the number of main stems green leaves,but the effect was not significant in the brown soil.Cal-cium application significantly promoted the accumulation of dry matter in different organs of peanuts in different growth stages on the two soils,effectively improved the distribution of dry matter and promoted the"flow"of dry mat-ter from the"source"of nutrients to the"fruit bank".Compared with the treatment without calcium application,the dry matter accumulation in mature pods of brown soil and red soil increased by 51.3%and 60.1%respectively in 2019,and in 2020 it increased by 44.3%and 46.7%respectively.The application of calcium fertilizer promoted the absorption and accumulation of calcium in peanut,increased the calcium content and accumulation amount in dif-ferent organs of peanut during the whole growth period significantly.At the same time,calcium application in-creased the distribution rate of calcium in peanut pods and stems,while the distribution rate of calcium in leaves,roots and gynophore decreased to varying degrees.In addition,calcium application effected the quality of peanuts.The O/L value and crude protein content of peanuts in red soil increased by 10.8%and 5.5%respectively,and in brown soil increased by 4.5%and 3.8%respectively.In conclusion,The application of calcium fertilizer is benefi-cial to improve the agronomic characteristics of peanut in acid soil,promote the accumulation of dry matter,improve agronomic characteristics,and accelerate the accumulation of calcium in the pod.The results of this study provided a theoretical basis for the improvement of calcium nutrition status of peanut in calcium-deficient soil.
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