Efficiency of arbuscular mycorrhiza fungal inoculation with rock phosphate on soil-available phosphorus, and drought stress, growth and yield of sugarcane under field conditions

摘要

A field study was conducted under rain-fed conditions to investigate the effect of arbuscular mycorrhizal fungi (AMF), Funneliformis mosseae KKU-BRP-KK6-2 inoculation with rock phosphate (RP) application on soil-available phosphorus (P), praline content in leaves, major nutrient uptake, biomass, promotion of growth, and productivity of sugarcane. The experiment design was carried out in a randomized complete-block design (RCBD) with three treatments: control, AMF inoculation and applied RP (AMF+RP), and applied RP (RP). Data were recorded every 4 months until harvest (approximately 12 months). Colonization intensity in the sugarcane root was increased by inoculation of AMF. The available P in the rhizosphere soil surrounding the sugarcane roots had the highest increase with the AMF+RP treatment at all growth times. At the period of water stress in the dry season (4 months), the plant with the AMF+RP treatment had the highest leaf praline content, significantly higher than the other treatments. At the major growth phase (8 months), the height and stem diameter of the sugarcane were significantly increased with the AMF+RP treatment. At harvest (12 months), the highest N, P and K uptakes by sugarcane were obtained with the AMF+RP treatment. The plant inoculated with AMF+RP had the highest level of plant dry biomass, cane yield and CCS, significantly higher than the non-inoculated control. Sugarcane plants with AMF+RP increased cane yield by 51%, when compared with the control. The results indicate that using Fu. mosseae KKU-BRP-KK6-2 together with RP as a biofertilizer improved soil P status and tolerance to drought stresses, and promoted plant growth and yield production of sugarcane.c