| The effects of sowing time and different water and fertilizer measures on the growth and development of sugarcane were significant,the suitable sowing time and water and fertilizer measures can improve the yield and quality of Guitang 32,this study selects the Guitang 32 and Liucheng 05-136 as experimental varieties,including Guitang 32,the treatment of Guitang 32 setting up three sowing date processing,respectively in January(J),group(M)in March and April(group A),each with two repeat.A total of six village,every village basal dressing with 100 days after sowing fertilizer.Three treatments were set for the Liucheng 05-136:W0.7F0.8,W1F1W,1.3F1.5 and CK,respectively.From the APSIM-Sugarcane of APSIM model under different sowing date processing of Guitang 32,cane stalk yield and sugar yield,total aboveground dry matter and dry matter of stem,leaf area index,soil nitrogen,nitrogen utilization efficiency indicators such as dynamic simulation and Liucheng 05-136 under different application with sewage sludge treatment of soil nitrogen dynamic simulation validation,the results showed that:1.The sowing period has great influence on the growth and development of Guitang 32.In seedling emergence,main stem height,sugarcane stem yield and sugar yield,sugar content in cane juice,etc.Planted in January and in March and April whether it has the advantage,and when the 325 days after sowing Guitang 32,Guitang 32 reached mature harvest conditions,compared to other varieties of sugarcane has great advantage.2.Guitang 32 has a time-dependent demand for nitrogen,which varies at different growth stages.The results showed that the daily nitrogen demand of sugarcane in group J reached the peak around 150 days after sowing,with a maximum of 0.44 g m-2 dropping to 0.1 g m-2 at maturity.The daily nitrogen demand of sugarcane in group M was up to 0.46 g m-2 around 120 days after sowing,and also decreased to 0.1 g m-2 at maturity.The daily nitrogen demand of group A reached A maximum of 0.61 g m-2 about 100 days after sowing,and the ripening stage dropped to 0.17 g m-2.The results show that sugarcane needs more nitrogen at tillering stage and early elongation stage.Therefore,the appropriate amount of nitrogen fertilizer can be used to meet the needs of sugarcane in the growth stage.The yield and quality of sugarcane can be improved to some extent.3.The model can better reflect the change of sugarcane yield under different sowing conditions.Due to the late seeding of M group and group A,and affected by typhoons,the M group and group A were affected by different degrees.The actual yield was lower than the simulation result,and the fitting result was not as good as that of J group.In the simulation,there are different varieties of Q138 substitute,so the simulation results are within the error range.In the treatment of three groups of different sowing periods,the simulation fitting of J group was the best,and the simulated yield was close to the actual yield of Guitang 32.The simulated value of fresh stem in group J was generally lower than the measured value in the later stage,the fitting of group M was good,and the deviation of group A was serious.The simulated values of group J,Ml and A1 were well fitted with the measured values,while the simulated values of M2 and A2 were high.Dry matter production group J was well fitted,followed by group A2 and group M and group A1.The measured values and simulated values of group LAI J,M and A are 0.50,0.54 and 0.88,respectively,which can reflect the reality.Because of the high yield and high sugar variety,the simulated results obtained by the Q138 substitute may slightly underestimate the actual production capacity of Guitang 32.4.In applying to increase the sugarcane yield and reduce water content for the purpose under the premise of sugar cane precision irrigation mode study,after fertilization can significantly affect liucheng 05-136 production,and the growth of the main stem height,stem diameter,the number of effective stem single stem weight,such as W0.7F0.8,WIF1,W1.3F1.5 three with sewage sludge treatment,W1F1 ratio for water saving section water fat,increase the sugarcane yield and quality is the most effective with sewage sludge treatment.5.The amount of nitrogen accumulation in the sugarcane field of liucheng 05-136 was decreased with the increase of the growth period.The amount of nitrogen accumulation in the aboveground increased with the increase of catchment.6.The simulation results of soil nitrogen at 0-60 cm soil layer under different water and fertilizer treatment conditions show that the measured value of soil nitrogen has little deviation from the simulated value with the growth of sugarcane.20-40 cm soil layer depth of the nitrogen content is lower than 0-20 cm and 40-60 cm,0-20 cm,20-40 cm,40-60 cm soil nitrogen content present a seedling stage to the tillering stage to increase gradually,gradually reduce the trend of the tillering stage to maturity. |
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