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The effects of straw‑returning and inorganic K fertilizer on the carbon–nitrogen balance and reproductive growth of cotton

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Journal of Cotton Research 2021年第4期4卷 347-357页

作者： HU Wei YU Chaoran ZHAO Wenqing LIU Ruixian YANG Changqinand ZHOU Zhiguo College of Agriculture Nanjing Agricultural UniversityNanjing 210095China Vegetable Research Institute Guangdong Academy of Agricultural SciencesGuangdong 510640China Institute of Industrial Crops Jiangsu Academy of Agricultural SciencesNanjing 210014China

Background:Many studies have indicated that straw-returning could meet part or even all of the potassium(K)demand for crop growth in the field,but few have compared the effects of crop straw as K source and inorganic K fertilizer on carbon–nitrogen(C–N)balance of cotton and the reproductive *** address this,field experiments were conducted using the cotton cultivar,Siza 3,under there treatments(CK as control group one,no crop straw and inorganic K fertilizer were applied;K150 as control group two,150 kg·ha^(-1) of K2O was applied;and W9000,9000 kg·ha^(-1) wheat straw,which could provide K2O about 150 kg·ha^(-1),was incorporated into soil).Results:Although the final reproductive organ biomass did not differ between W9000 and K150,W9000 had a higher ratio of reproductive organ biomass to total biomass(RRT),suggesting that straw-returning was more conducive to the allocation of biomass to reproductive *** theoretical maximum biomass of reproductive organ was higher,but the average and maximum accumulation rates of reproductive organ biomass were 2.8%∼8.3%and 2.5%∼8.2%lower under W9000 than ***,the duration of rapid-accumulation period for reproductive organ biomass(T)was 2.0∼2.8 d longer under W9000 than K150,which was a reason for the higher RRT under ***-returning altered the dynamics of leaf K with the growth period,so that W9000 had a more drastic effect on leaf C metabolism than ***,lower soluble sugar/free amino acid and C/N ratios were measured under W9000 than K150 at boll-setting(BSS)and boll-opening(BOS)*** leaf net photosynthetic rate,sucrose phosphate synthase and sucrose synthase activities,and lower acid invertase activity were observed under W9000 than K150 at BSS and BOS and these were more conducive to sucrose ***,less sucrose was measured under W9000 than K150 at these *** should be because straw-returning promoted the assimilate transport capacity when compared with inorganic

关键词： Gossypium hirsutum L. Crop straw inorganic potassium fertilizer Reproductive growth C-N balance

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