摘要
采用L9（34）实验设计,即三因素三水平[施有机肥（22.5、15、7.5 t/hm2）;氯化钾（300、250、150 kg/hm2）,尿素（187.5、250、325 kg/hm2）],研究不同施肥处理对萝卜农艺性状指标的影响。结果表明,单个萝卜根重、可食率、萝卜总产量、总糖等指标中各处理都显著大于对照CK,其中以中等施肥水平最高。综合分析表明在岷江上游生产绿色食品萝卜最佳的施肥方案是A2B2C2（即施有机肥15 t/hm2,氯化钾250 kg/hm2,尿素250 kg/hm2）。不同施肥处理对土壤养分含量影响显著,表层土壤（0~20 cm）比下层（20~40 cm）的有机质含量、全氮、全磷、硝态氮、有效氮、有效磷、有效钾含量高,上下土层的铵态氮含量没有显著差异;土壤上层的粉粒含量高于下层,粘粒含量低于下层。相关性分析表明,土壤中的砂粒（2~0.05 mm）和粉粒（0.05~0.002mm）与养分含量呈正相关关系,粘粒（〈0.002 mm）与土壤养分含量呈负相关关系。这些结果表明在岷江上游的耕地褐土中,与养分含量相关的有机无机复合体是形成土壤肥力的关键因素。因此,在地力培肥中适当增施有机肥,促进褐土这种新成土的土壤团聚体的形成是获得保肥保水的土壤从而确保农作物增收的重要措施。
Because of appropriate ecological conditions（e.g.light and temperature） in the upper reaches of Minjiang River was believed to be favorable to development of greenfood bases.This study focused on comparisons of radish quality and soil property under different fertilizer regimes,in order to provide scientific foundation for policy decision for fertilizer management and environmental conservation,also to produce greenfood vegetable in the study area.We conducted a three-factor,three-level factorial experiment,i.e.,organic fertilizer（22.5,15,7.5 t/hm2）;potassium chloride（300,250,150 kg/hm2）,and carbamide（187.5,250,325 kg/hm2）,and analyzed the collected data to decide the effect of different fertilizer on the agronomic properties of radish.Each fertilizer treatment was significantly larger than control（CK） in indices including single radish root weight,esculent rate,total radish yield,total sugar and the mid-level treatment was the highest of these indices.Comprehensive analyses indicated that the optimal fertilizer regime was A2B2C2（organic fertilizer 15 t,potassium chloride 250 kg,calcium phosphate 75 kg,carbamide 250 kg/hm2） to produce greenfood radish in the upper reaches of Minjiang River.Fertilizing significantly affected on soil nutrient component and properties.The contents of organic matter,total nitrogen,total phosphorus,NO3-Nitrogen,available nitrogen,available phosphorus,available potassium were higher in surface layer soil（0-20 cm） than underlayer soil（20-40 cm）,NH＋4 Nitrogen did not significantly differ between surface and underlayer soils.Correlation analysis indicated that soil sandy grain （2-0.05mm） and powder grain（0.05-0.002 mm） content were positively correlated with soil nutrients,but viscid （0.002 mm） grain was negatively correlated with nutrient content.This suggests that the inorganic-organic matter compound is the key to improve fertility for cinnamon soil in the upper reaches of Minjiang River.Therefore,preventing the loss of soil fertilizer and
出处
《西南农业学报》
CSCD
北大核心
2010年第6期1959-1964,共6页
Southwest China Journal of Agricultural Sciences
基金
国家科技支撑计划十一五课题"坡地作物高产高效生产技术研究"(2008BAD98B03)
关键词
萝卜
施肥
土壤颗粒
蔬菜基地
坡耕地
岷江上游
Radish
Fertilizer
Soil grain
Vegetable base
Slope land
Upper reaches of Minjiang River
