施用钙肥对盐胁迫下花生荚果发育动态的影响

以花育25为材料,在0.3%NaCl盐胁迫水平下设置4个钙肥施用梯度(T1(0)、T2(75)、T3(150)和T4(225)kg.hm-2 CaO)进行盆栽试验,研究施用钙肥对盐胁迫下花生荚果发育动态及充实度的影响。结果表明,花生荚果干物质积累与体积膨大过程呈“慢-快-慢”的变化趋势,且均可用Logistic方程拟合。盐胁迫条件下,荚果及籽仁干物质积累和体积最大生长速率出现时间(Tm)分别较CK提前4-5 d和2-5d左右,最大生长速率(Vm)分别较CK均显著降低。外源钙的施入极大缓解盐胁迫对荚果膨大与充实的阻碍作用,其中T3处理最为显著。荚果及籽仁干物质积累和体积增大的最大生长速率均较T1处理显著提高,且最大生长速率出现时间较T1均明显延迟,荚果充实度得到提高,最终提高产量。综合荚果发育动态、荚果充实度及产量,在0.3%盐胁迫条件下钙肥适宜施用量为150kg.hm?2CaO。

Calcium Fertilizer Affects the Development of Peanut Pod Under Salt Stress

The objective is to study the effects of calcium fertilizer application on the developmental dynamics and plumpness of peanut pod under salt stress.‘Huayu 25’was used as material. Under 0.3%NaCl stress, the pot experiment was conducted with four calcium fertilizer levels: T1 (0 kg/hm2), T2 (75 kg/hm2), T3 (150 kg/hm2) and T4 (225 kg/hm2) CaO. The results showed that the dry weight accumulation of pod and volume expansion process presented a“slow- rapid- slow”trend. And the cumulative dynamics was simulated by a Logistic equation. Under salt stress, the date of maximum growth rate (Tm) of dry weight accumulation and volume of pod and kernel arrived 4-5 d and 2-5 d ahead of CK, and the maximum growth rate (Vm) was significantly lower than CK, respectively. The exogenous calcium application obviously alleviated the inhibition of peanut pods enlargement and enrichment under salt stress, and the effect of T3 was the most significant, of which the maximum growth rate of dry weight accumulation and volume increasing of pod and kernel were significantly higher than that of T1, while the date of maximum growth rate was significantly later than T1, the pod plumpness was increased, and so did the yield of peanut. According to the developmental dynamics, plumpness of peanut pods and yield, the suggested calcium fertilizer amount is 150 kg/hm2 CaO under 0.3% salt stress.