Abstract: In order to explore the suitable proportion of organic fertilizer and phosphate fertilizer for rice planting in coastal saline soil,the effect of organic manure and phosphorus fertilizer on the rice yield,effective tillering,net photosynthetic rate,phosphorus turnover agronomy efficiency were investigated in 2015-2016 year,which was to choose the best formula of the organic manure and phosphorus supply in the coastal saline soil for rice.The micro zone test was adopted with two factors and 8 treatments,phosphate fertilizer (3 P (P₂O₅) levels:P0,0 kg/ha; P1,64 kg/ha,and P2,128 kg/ha) and organic fertilizer (3 C levels:C0,no organic fertilizer; C1,450 kg/ha(organic fertilizer 1 000 kg/ha); C2,900 kg/ha (organic fertilizer 2 000 kg/ha).Which were CK(no fertilization T1); No phosphate(0 kg/ha,T2); Low phosphate(64 kg/ha,T3); High phosphate(128 kg/ha,T4); Low carbon and low phosphate(450 kg/ha+64 kg/ha,T5); Low carbon and High phosphate(450 kg/ha+128 kg/ha,T6); High carbon and Low phosphate(900 kg/ha+64 kg/ha,T7);High carbon and High phosphate(900 kg/ha+128 kg/ha,T8).Results revealed that,there was no significant difference in T5 (9 901±682)kg/ha and T8(10 134±260 kg/ha) treatment,which was significantly higher than other treatment,for the yield of rice.The fertilizer use efficient of T5 and T8 treatments were not significant difference, but both were significantly higher than other treatments in 2016 year. The tillering efficiency of T5 treatment was of 700%, and that of T8 treatment was of 680%, and there was no significant difference between them, but the effective tillering number had the same trend. There was no significant difference in the effective tillering efficiency between treatments (81%-88% in 2015). In 2016, the effective tillering efficiency of T3 and T8 were 78% and 75%, respectively, while the effective tillering efficiency of other treatments was stable at 82%-88%. Low phosphorus treatment, the soil total phosphorus amount in tillering stage low carbon was significantly lower than no carbon or high carbon treatment, and the latter two treatments was no significant difference. The soil total P content was no significant change during the whole growth period of T5 treatment. In tillering stage and booting stage soil total phosphorus amount of the high P treatment, whether low carbon or high carbon treatment was no significant difference with no carbon, and with the growth period decreased which indicated that the phosphate fertilizer level, phosphorus has a strong risk of leaching. Regardless of low phosphate or high phosphorus treatments, the content of available P in high carbon soil decreased at tillering stage, booting stage or heading stage, and showed the same trend at T6 treatment. However, in the same two years after T5 treatment, the difference was not significant. Soil microbial biomass phosphorus at T5 and T8 at heading stage was (17.8, 19.6 mg/kg, 2015), (19.2, 22.4 mg/kg, 2016), but there was no significant difference between them, and higher than other treatments, which indicated that carbon addition could regulate soil microbial biomass phosphorus in different growth stages. In coastal saline land paddy rice planting, the yield of rice was the best when the application of 450 kg/ha of organic manure and 64 kg/ha of phosphorus fertilizer (P₂O₅), and the risk of phosphorus leaching was low.

Key words: Saline soil, Rice, Phosphorus, SMBp, Soil available P

CLC Number: 

• S18