Effect of plastic mulching and potassium rate on yield, potassium use efficiency of oil sunflower

doi:10.7505/j.issn.1007-9084.2019.03.016

Abstract

Abstract:

To find the optional cultivation measure for synergistic improvement of yield and potassium use efficiency, oil sunflower field experiments were carried out from 2015 to 2017 under 3 plastic mulching cultivation modes in semi-arid area in Gansu Province. Oil sunflower cultivar Longkuiza 3 was used. The 3 modes included open field (Z1), full plastic-film double-furrow sowing (Z2), and full plastic-film double-furrow sowing with supplemental irrigation (Z3). The 4 potassium rates were 0 (K0), 48 (K48), 84 (K84) and 120 kg/hm2 (K120). Results showed that plastic mulch cultivation and potassium rate had significant effects on yield, dry matter accumulation and potassium use efficiency. The interaction between modes and potassium rates was significant. The effects on grain yield, dry matter accumulation and potassium utilization efficiency were in the order of Z3>Z2>Z1 with significant differences. Compared to Z1 mode, Z3 modes increased yield and potassium utilization efficiency 170.1% and 103.9% respectively; and B modes increased yield and potassium utilization efficiency 184.3% and 143.7%. Yield and dry matter accumulation were both increased under potassium rates in the order of K120>K84>K48>K0. The significant differences were found between the potassium rates except between K120 and K84. With the increase of potassium rates, potassium partial factor productivity was decreased, while potassium agronomic efficiency and utilization efficiency were improved. The latter two traits reached the peaks under 84 kg/hm2. It indicated that synergistic improvement could be acheived on oil sunflower yield and both potassium agronomic efficiency and utilization efficiency. In summary, in this experimental field condition, the C mode (full plastic-film double-furrow sowing with supplemental irrigation) and 84 kg/hm2 potassium rate were the optimal, and the effect of supplementary irrigation was obvious.

Key words: oil sunflower, plastic mulching cultivation, potassium rate, full plastic-film double-furrow sowing cultivation, yield, potassium use efficiency

ZHANG Ping-liang, GUO Tian-wen*, ZEN Jun, LI Shu-tian, LIU Xiao-wei, TAN Xue-lian, DENG Ming-rui. Effect of plastic mulching and potassium rate on yield, potassium use efficiency of oil sunflower[J]. 中国油料作物学报, 2019, 41(3): 435-.

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