| Water is an important factor affecting cucumber growth and development.In order to study the growth model of cucumber in solar greenhouse under different water conditions,the applicability of the model under different water conditions in Ningxia was evaluated.Using cucumber variety ’Huangru No.4’ as material,the experiment was carried out in greenhouse of Ningxia Horticultural Industrial Park from March to July and August to November in 2020.Through test inside the greenhouse temperature,light,solar radiation and different moisture conditions of cucumber growth period,leaf area,plant dry weight,the production index,using the spring crop data on cucumber growth period,leaf area index,dry matter production and distribution and parameter calibration and to establish a production model,using the autumn crop data test precision of the model.The aim was to provide a reference for optimizing the management of greenhouse cucumber production and environmental regulation in Northwest China and improving the economic and ecological benefits of greenhouse cucumber production.The main research results are as follows:1 Study on growth period model of Cucumber in Solar GreenhouseDifferent water treatments had no effect on cucumber growth period.Using the physiological development time model to simulate the cumulative physiological development time of cucumber from planting stage,flowering and fruiting stage,fruit ripening stage,early melon stage,filling stage and end melon stage required 20,3,5,10,33 and 14 days.The standard error(RMSE)between the simulated value and the measured value was 3.27 d.The normalized standard error(nRMSE)was 15.84%,and the compliance index(D)was 0.90.2 Study on leaf area index model of Cucumber in Solar GreenhouseThere was a linear relationship between dry matter production and the logarithm of cumulative thermal product in cucumber after slow seedling stage.A curve was used to simulate the dynamic change of cucumber dry matter production under different water conditions.The R~2 of RMSE,NRMSE,D value and 1:1 line of dry matter production prediction results under different water treatments were in the range of 285.57～504.25 kg/hm~2,12.48～19.75%,0.96-0.99,0.89～0.96,respectively.T3 Study on dry matter production and distribution model of Cucumber in Solar GreenhouseThere was a linear relationship between dry matter production and the logarithm of accumulated radiant heat product after slow seedling stage.The curve was used to simulate the dynamic changes of dry matter production in different organs of Cucumber under different water conditions.The results showed that the R~2 of RMSE,nRMSE,D value and 1:1 line were 285.57～504.25 kg/hm~2,12.48-19.75%,0.96～0.99 and 0.89～0.96,respectively.The distribution index of total dry matter in shoot,root and shoot organs of cucumber only changed with heat accumulation,but did not change significantly with irrigation amount.The distribution index(DI)=a+b ×Exp(-TEP/c)was used to simulate the dry matter distribution among the aboveground,underground and aboveground organs of cucumber.The R~2 values of RMSE,nRMSE,D value and 1:1 of dry matter distribution prediction results for each organ under different water treatments were as follows:aboveground part:321.24～569.09 kg/hm~2,11.04～19.41%,0.92～0.98,0.89～0.96;Underground part:6.78～8.02 kg/hm~2,22.75～29.23%,0.67～0.89,0.66～0.81;Leaf:131.22～377.86 kg/hm~2,15.00～29.84%,0.82～0.93,0.81～0.97;Stem:131.56～184.76 kg/hm~2,22.80～29.56%,0.81～0.90,0.85～0.97;Fruit:212.00～312.30 kg/hm~2,17.26～29.14%,0.92～0.98,0.89～0.96.4 Study on yield formation model of Cucumber in Solar GreenhouseCucumber yield was determined by the accumulation of harvested fruits.Harvesting index and YIELD model YIELD=(FW/HI)/0.031 were used to simulate cucumber YIELD.RMSE,nRMSE,D and R~2 of cucumber yield under different water treatments ranged from 1204.06～3753.12 kg/hm~2,16.06～19.54%,0.95～0.99 and 0.87～0.97,respectively. |
