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中国油料作物学报 ›› 2016, Vol. 38 ›› Issue (5): 619-.doi: 10.7505/j.issn.1007-9084.2016.05.012

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Oil flax phosphorous transformation, distribution and utilization under nitrogen phosphorous combination on dry land

  

  1. 1. College of Life Sciences and Technology, Gansu Agricultural University, Lanzhou 730070, China; 2. Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou 730070, China; 3. College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China; 4. College of Information Sciences and Techn Gansu Agricultural University, Lanzhou 730070, China)
  • Online:2016-10-28 Published:2017-01-09

Abstract:

: For reasonable fertilization of oil flax on dry land (on hilly area of the loess plateau), the effect of nitrogen-phosphorous combination on phosphorus utilization was investigated by using cultivar Longyaza 1. Four fertilizer treatments were designed: 2 for nitrogen (N1: 75 kg·hm-2 and N2: 150 kg·hm-2) and 2 for phosphorus (P1: 75 kg·hm-2 and P2: 150 kg·hm-2). Their combinations were coded as N1P1, N1P2, N2P1 and N2P2. N0P0 was the control without additional nitrogen and phosphorous. Results showed that the trends of phosphorus uptake at different growth stages were similar. Phosphorus absorption of oil flax reached top level during anthesis to maturity. Leaf was the main organs for phosphorus transformation. 25.03% to 72.52% more phosphorus, a significantly higher level were translocated under N2P1. 38.07% to 51.88% of grains phosphorus accumulation were transferred by leaves. Especially under N2P1, 36.28% more phosphorus were translocated from leaves to leaves. Grains obtained the most phosphorus (40.11%-45.86%) followed by stem (31.34%-36.36%). Compared to N0P0, grain yields under N1P1, N1P2, N2P1 and N2P2 were significantly enhanced by 18.95%, 32.26%, 50.41% and 38.29% respectively. The maximum phosphorus harvest index, phosphorus agronomic efficiency and phosphorus apparent use efficiency were 45.86%, 6.54 kg·kg-1 and 21.51% respectively under N2P1. Based on synthesized grain yield and phosphorus utilization efficiency, the optimal nitrogen and phosphorus application rate for oil flax was 150 kg·hm-2 (N) and 75 kg·hm-2 (P2O5) on hilly area of the loess plateau.

Key words: Oil flax, Nitrogen phosphorous combination fertilization, Uptake and transformation of phosphorous, Phosphorous utilization efficiency