Cultural factors influencing high yield and good quality Linum usitatissimum (Tianya 9) were investigated. The correlations between these factors and its yield were analyzed. Path coefficient and principal component analysis were conducted, adopting uniform design of the 8 cultivating factors, i.e. planting density (X1), base nitrogen quantity (X2), base phosphorus quantity (X3), base potassium quantity (X4), foliar fertilizer (potassium dihydrogen phosphate, X5), foliar fertilizer (boron fertilizer, X6), growth regulator (multi-effect azole, X7) and growth duration irrigation amount (X8), aiming at exploring better cultivating plan of L. usitatissimum for Gansu Province. The results indicated that the factors influencing the yield of L. usitatissimum were X1, X7, X2, X3, X5 and X4 in a descending order. Simulation and optimization of the highest yield was further implemented. Frequency analysis showed that the cultivating factors resulting in yield higher than 173.58 kg . hm-2 were 4. 68 - 4. 92 kg . hm-2 (X1) , 11. 59 - 14. 75 kg . hm-2 (X2), 17.26- 21.95 kg . hm-2 (X3), 7.00-12.50 kg . hm-2 (X4) , 1.41-1.81 kg . hm-2 (X5) and 751.74- 954.04 g . hm-2 (X7).
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