Research On High Quality And Yield Cultivation Techniques Of Spring Advance And Autumn Delay Of Taro Cultivated Plastic House In Jianghuai Region

Taro[Colocasia esculenta(L.)Schott]is a wet herb in Araceae family with high nutritional value and many functional components.At present,the area of taro cultivation in Jianghuai region is increasing year by year,with great potential for development.However,taro has a long reproductive period,which is not conducive to crop rotation arrangements with other crops.The preliminary exploration of taro cultivation in spring and autumn shows that there are problems of poor yield quality of taro in spring cultivation and high seed requirement in autumn cultivation.In this paper,we investigated the effect of different fertilizer treatments and plant growth regulator treatments on the yield and quality of taro,and investigated the propagation technology of taro cutting,in order to improve the yield and quality of taro in early spring cultivation and reduce the number of seeds needed for taro seedlings in post-autumn cultivation.Specific experimental results are as follows:1.The effects of two different fertilizer application methods on taro yield and quality were compared at the same fertilizer application period,fertilizer application rate and fertilizer application ratio.The results showed that in taro spring advance cultivation,the balanced fertilizer application method was superior to the later potassium fertilizer application method in terms of yield at the same time point,where the difference in yield reached 208.44 kg/667 m2 at 99 d after planting and 563.56 kg/667 m2 at 145 d,but the difference in quality was not significant.2.The effects of three nitrogen and potassium fertilizer ratios on the yield and quality of spring advance cultivated taro were compared.The results showed that the optimum nitrogen and potassium fertilizer application ratio for spring advance cultivated taro was 1:2,and there were significant advantages in individual sub-taro weight,single plant weight,yield and starch content compared with two nitrogen and potassium ratios of 1:1 and 1:1.5.3.Four plant growth regulators were selected to compare their effects on yield and quality of spring advance cultivated taro using water foliar spray as control.The results showed that different plant growth regulators had different abilities for above-ground nutrient translocation,with the treatment(Lan Bao wang)and the treatment(polyconazole)having a better promotion effect and the Lü Bang Agricultural rootstock expansion agent having an inhibitory effect.Compared with the clear water control,the yield,single plant weight and starch of the treatment(Lan Bao wang)were better at 160 d harvest,with a yield of 2929.74 kg/667 m2,a single plant weight of 967.78 g and a starch content of 55.66%;the flavonoid content and total phenol content of the treatment(polyconazole)at 160 d harvest were 1.82 mg/g and 9.51 mg/g,which were better than those of the clear water control treatment(0.54 mg/g,3.52 mg/g)than the clear water control treatment(0.54 mg/g,3.52 mg/g).4.The effects of three different parts of cut blocks and three different plant growth regulators on the cultivation of Taro after autumn extension were compared with seed bulb seedlings as the control group.The test results are as follows,the reproduction coefficient of taro between 4 and 6;different parts of the cut block growth potential also varies,the top buds of the best performance of the sprouting rate and above-ground morphological indicators,followed by the middle buds,the worst basal buds;different growth regulator treatment on the cut block inconsistent,6-BA and polyconazole treatment on the cut block seedlings have a strong promotion effect,improve the different parts of the cut block sprouting rate and cut block seedlings after transplanting growth The yield quality of seedlings was not reduced,in which the yield of seedlings cut from different parts of 6-BA treatment was higher at 1400 kg/667 m2 than that of seedpods(1398.86 kg/667 m2).In summary,spring season taro should be fertilized with a balanced fertilization of nitrogen and potassium throughout the reproductive period,with the ratio of nitrogen to potassium being 1:2.Under the conditions of this experiment,taro spring advance cultivation should adopt the cultivation measures of balanced nitrogen and potassium fertilization,1:2 nitrogen and potassium fertilization ratio and foliar spraying of Lan Bao Wang or polygonazole plant growth regulator during the growth period,which can improve the economic efficiency by harvesting and marketing earlier in August～September without affecting the yield quality;50 mg/L 6-BA treatment can effectively improve the budding rate,growth potential and yield of taro cut block propagation.