滴灌番茄临界氮浓度、氮素吸收和氮营养指数模拟
作物的氮浓度随生物量的增加而下降,临界氮浓度是指在一定的生长时期内获得最大生物量时的最小氮浓度值。该文在滴灌条件下,基于3a不同的氮素水平试验,构建了加工番茄地上部生物量的临界氮浓度稀释曲线模型。结果表明,临界氮浓度与地上部最大生物量之间符合幂指数关系,相关系数为R~2=0.947,加工番茄最高(%Nmax)、最低(%Nmin)临界氮浓度稀释模型亦符合幂指数关系,相关系数分别为R~2=0.959、R~2=0.925。基于临界氮浓度建立了加工番茄氮素吸收模型(Nupt)、氮素营养指数模型(NNI),可作为加工番茄氮素营养状况的判别指标,氮素吸收和氮营养指数模型对新疆北疆加工番茄种植区的适宜施氮量...
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| Published in | 农业工程学报 Vol. 29; no. 18; pp. 99 - 108 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
新疆生产建设兵团绿洲生态农业重点实验室,石河子 832003
2013
石河子大学农学院,石河子,832003%石河子大学农学院,石河子 832003 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.3969/j.issn.1002-6819.2013.18.013 |
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| Summary: | 作物的氮浓度随生物量的增加而下降,临界氮浓度是指在一定的生长时期内获得最大生物量时的最小氮浓度值。该文在滴灌条件下,基于3a不同的氮素水平试验,构建了加工番茄地上部生物量的临界氮浓度稀释曲线模型。结果表明,临界氮浓度与地上部最大生物量之间符合幂指数关系,相关系数为R~2=0.947,加工番茄最高(%Nmax)、最低(%Nmin)临界氮浓度稀释模型亦符合幂指数关系,相关系数分别为R~2=0.959、R~2=0.925。基于临界氮浓度建立了加工番茄氮素吸收模型(Nupt)、氮素营养指数模型(NNI),可作为加工番茄氮素营养状况的判别指标,氮素吸收和氮营养指数模型对新疆北疆加工番茄种植区的适宜施氮量诊断结果一致,均以300kg/hm2为最佳施氮量。该研究所建立的临界氮浓度稀释曲线模型较前人建立的模型更具机理性,因此,该模型所得出的分析结果是合适和可靠的,并且可用于指导加工番茄动态精准施肥及为氮素优化管理的建立提供参考。 |
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| Bibliography: | 11-2047/S drip irrigation, nitrogen, models, processing tomato, critical nitrogen concentration, dilution curve,nitrogen nutrition index In many crops, nitrogen concentration decreases with increasing plant mass. A critical N concentration in plant above-ground biomass, which is defined as the minimum N concentration required for maximum plant growth, can be found at any time in the growth cycle. To determine the critical N concentration dilution curve for drip-irrigated processing tomato, three years of field experiments with five levels of N applications (0, 75, 150, 300, 450, 600 kg/hm2) were carried out in Shihezi city, northem Xinjiang. Results showed that N concentration in above-ground biomass declined with accumulated physiological development time after emergence. The relationship between the above-ground biomass and critical N concentration can be described by the power equation (%Nc=4.352DW^0.274), with ac=4.352 and b=0.274 for three experiments. Taking into account all data from the three experiment |
| ISSN: | 1002-6819 |
| DOI: | 10.3969/j.issn.1002-6819.2013.18.013 |