Studies On Mineral Nutrients And Fertilizer Application Of Castanea Mollissima BL.

Mineral nutrients are key factors in raising yield and improving quality of Chinese chestnut. Based on the field investigations, potted plant experiments, field fertilization experiments and soil management experiments, studies carried out on the diagnosis criterion of Castanea mollissima BL., fertilization and soil management. The main results were as follows:Based on the study of correlations between leaf nutrient elements and yield of C. mollissima, the preliminary diagnosis criterion of some mineral nutrient elements in leaves of C. mollissima and fertilization proposal in different soil condition were put forward.The study of mineral nutrient elements trend in leaves of C. mollissima showed that the best period for leaf sampling was 10 July to 10 Aug, The fertilizer of N, P and K should be applied at the end of May, June and July, the fertilizer of B should be applied at the beginning of June and mid-July. There were some correlations between each mineral element in leaf. The nutrient elements in leaf were related to ones in the soil. There was distinct positive correlation between the content of N in soil and the yield of C. mollissima.In the fertilization experiment, the dosage of 200g/m urea and 300g/m superphosphate improved yield of C. mollissima positively. Also, the dosage of 250g/m2(NH4)2HPO3 fertilizer improved yield of C. mollissima. Fertilizing only N or K manure was better than only applying P manure to improve the yield of C. mollissima. The effect of fertilizing manure separately was better than once. The dosage of 40g/m2 and 50g/m2 K2SO4 manure and 20g/m2 KC1 manure improved yield of C. mollissima positively. K2SO4 manure was more propitious to absorbing of K by plant than KC1 manure.The study of water and manure efficiency with different soil management, including mulching grass, growing grass, covering membrane and conventional tillage, showed: Mulching grass was more propitious to water maintaining than other soil management, and it improved yield of C. mollissima. Soil nutrient contents were higher under growing grass management than others.