Dissertation > Agricultural Sciences > Crop > Economic crops > Oil crops > Rapeseed ( Brassica )

Effect of Different Fertilizer Application and Proportion for Winter Oilseed Rape’s Growth

Author TianChang
Tutor PengJianWei
School Hunan Agricultural University
Course Plant Nutrition
Keywords winter oilseed rape yield accumulation of nutrient agronomic characters chlorophyll
CLC S565.4
Type Master's thesis
Year 2011
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Rape is the crop that needs much fertilizer to achieve high yield and quality to meet their nutritional needs. Therefore, it’s an important prerequisite to study rape’s efficient fertilization technology to reach there highly yield production. Through two years field plot experiments was studied to research the effect of different NPK fertilizer ratio for the impact of new varieties hybrid rapeseed Xiangzayou 763, to its agronomic traits, nutrient uptake, yield and yield components, which also explored the effect of the organic and inorganic fertilizer application for hybrid rapeseed Xiangzayou 763, the main results shows that:In the context of established test, nitrogen ratio had the maximal impact on rapeseed yield, followed by the percentage of phosphorus and potassium ratio with minimal impact on grain yield. Twelve treatments with a different proportion of NPK in test one, with N:P2O5:K2O= 1:0.5:0.58, the grain had the highest yield for 1830kg/hm2, followed by N:P2O5:K2O= 1:0.5:0.88, for the 1800 kg/hm2, N:P2O5 K2O= 1:0.4:1.4 the lowest grain yield of treatment for 1350 kg/hm2. Test two with seven different kinds of NPK ratio, the production with N:P2O5:K2O equals to 1:0.5:0.5 and 1:0.43:0.57 ranks two front, yields were 2231.13 and 2065.26 kg/hm2, respectively. The lowest for the N:P2O5:K2O equals to 1:0.6:0.8. But sum up the results of the two-year test, we believed that the treatment with 1:0.5:0.5 of N:P2O5: K2O was more fertilizer-saving, as the most appropriate scale.Nitrogen ratio has the maximal impact on growth of winter oilseed rape and followed by phosphorus ratio. The total leaf, the number of green leaves, maximum leaf length and leaf width, root crown diameter, branch number and dry weight per plant and other agronomic traits were higher with high nitrogen ratio of processing than the proportion of low-nitrogen treatment. Chlorophyll content increased as the proportion of nitrogen application increased, and the chlorophyll to some extent reflect the variation of rapeseed production. At the same time, with yield components. Effective pod number per plant has the greatest impact on grain yield, and less impact on grain weight and each pod. And oil yield was consistent with yield variation.Accumulation of plant N and P with the proportion of nitrogen and phosphorus fertilizer (the same with remaining fertilizer application rate) increases, respectively, while plant K accumulation did not show above law. Although the different treatment of grain yield was not entirely consistent with nutrient accumulation in the size of the order, but the two were simultaneous in the overall trend, namely, the accumulation of NPK was high in the amount of treatment with high yield. The accumulation of NPK was low in the amount of treatment with low yield. Three kinds of NPK fertilizer use efficiency tends to decrease with the increased of fertilizer application rate (the same with remaining fertilizer application rate). Different from the change trends of grain yield, with the sharpest decrease in K utilization.In the test of different organic manure ratio, yield and oil content of each treatment was 10%OM treatment>0%OM treatment>30%OM treatment>50%OM treatment, yields for 10% OM treatment reached 2055.00 kg/hm2, which was significantly higher than the other treatments; yields for 0% OM treated was 1898.08 kg/hm2, slightly higher than 30%OM treatment but significantly higher than 50%OM treatment; Therefore, in this experimental condition,10%OM treatment was most reasonable in organic and inorganic fertilizer proportion application. At full blooming stage, Agronomic traits in all treatments can better reflect the grain yield in harvest time, particularly the correlation coefficients of biomass and the branch number of the 10 cm above and yield were both 0.990**, achieve highly significant level. At the same time, under reasonable organic and inorganic fertilizer proportion (10%OM treatment), the soluble sugar, free amino acids were both higher, and nitrogen accumulation was consistent with yield variation.

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