缓释肥用量对薄壳山核桃容器苗生长及养分含量的影响

【目的】探究缓释肥用量对薄壳山核桃容器苗生长和养分状况的影响,确定培育薄壳山核桃容器苗合理的缓释肥用量。【方法】采用单因素完全随机区组设计,设置不同处理T0、T1、T2、T3(缓释肥用量对应为0、3、6、9 kg/m³),测定和比较薄壳山核桃苗木生长及植株N、P、K养分含量。【结果】与对照(T0)相比,不同缓释肥处理均显著促进薄壳山核桃苗木苗高、地径、单株生物量、根系总长、根系总表面积、根系总体积、根系平均直径和各器官N、P、K含量,改善了根冠比且以T1处理效果最佳;随着处理浓度增加,促进效应下降。动态测定表明,缓释肥处理能保持试验期苗高与地径的持续快速生长,其中地径的持续时间更长,生长后期(8月中旬后)与苗高呈现非同步性。【结论】适量的缓释肥用量能促进薄壳山核桃容器苗的生长、生物量积累和根系发育,促进效应与改善植株N、P、K养分含量有关;缓释肥施用量以3 kg/m³较佳。

Effects of slow release fertilizer dosage on growth and nutrient contents of Carya illinoensis container seedlings

【Objective】 The objective of the present study was to explore the effects of slow-release fertilizer dosage on the growth and nutrient contents of pecan (Carya illinoensis) container seedlings and to determine a reasonable slow-release fertilizer dosage for cultivating these seedlings. 【Method】 A single-factor, completely randomized block design was used to set up the treatments T0, T1, T2 and T3 (0, 3, 6 and 9 kg/m³, respectively) with different slow-release fertilizer dosages, and the growth of seedlings and nutrient content [nitrogen (N), phosphorus (P) and potassium (K)] were determined and compared. 【Result】 Compared with the control treatment (T0), the different slow-release fertilizer treatments significantly promoted seedling height, root collar diameter, biomass per plant, total root length, total root surface area, total root volume, root diameter, and N, P, and K levels in all organ. The nutrient content improved the root-to-shoot ratio, and the treatment effect was found to be optimum with T1. As the fertilizer concentration increased, the promoting effect decreased. Dynamic measurement showed that the slow-release fertilizer treatment maintained rapid increase in seedling height and root collar diameter during the treatment period; the root collar diameter lasted longer than other factors, and the growth stage (after mid-August) and seedling height were non-synchronous. 【Conclusion】 An appropriate slow-release fertilizer dosage can promote growth, biomass accumulation, and root development in pecan container seedlings. The promoting effect was related to increased nutrient content, and the optimum fertilizer dosage was 3 kg/m³.