scholarly journals Plant Growth and Cutting Production of Container-grown Pelargonium Stock Plants as Affected by N Concentration and N Form

1992 ◽  
Vol 117 (2) ◽  
pp. 234-238 ◽  
Author(s):  
Ruth Ganmore-Neumann ◽  
A. Hagiladi
Keyword(s):  
Plant Growth ◽  
N Uptake ◽  
Nitrogen Recovery ◽  
Recovery Efficiency ◽  
Pelargonium Zonale ◽  
Minimum Concentration ◽  
Nitrogen Recovery Efficiency ◽  
N Concentration ◽  
Mother Plants ◽  
Cutting Production

Stock plants of Pelargonium zonale `Empress' were grown for 130 days on coarse tuff medium in a greenhouse. Four N concentrations (50, 100,200, and 400 mg N/liter) and three NO3-: NH4+: ratios (70:30, 60:40, and 40:60) were applied. The development of mother plants, production of cuttings, and the recovery of applied N were measured. Number of cuttings was not affected by any treatments except for the low N concentration. The proportion of absorbed N was higher than that of water in the plants treated with 50 or 100 mg N/liter, while those fertilized with 200 or 400 mg N/liter absorbed more water relative to N uptake. Nitrogen recovery efficiency decreased from 70% to 10% for the 50- to 400-mg N/liter treatments, respectively. Percentage of applied N lost by leaching (30% to 70%), and N that could not be accounted for (0.5% to 20%), increased with increasing N concentration and NH4+ percentage in the solution. The minimum concentration to be used in fertilization of Pelargonium mother plants is 100 mg N/liter. Optimal N supplied ranged between 100 and 200 mg N/liter.

scholarly journals Optimal Nitrogen Practice in Winter Wheat-Summer Maize Rotation Affecting the Fates of 15N-Labeled Fertilizer

Agronomy ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 521
Author(s):  
Haiyan Liang ◽  
Pengfei Shen ◽  
Xiangze Kong ◽  
Yuncheng Liao ◽  
Yang Liu ◽  
...  
Keyword(s):  
Crop Yield ◽  
N Uptake ◽  
N Fertilization ◽  
Nitrogen Recovery ◽  
Shaanxi Province ◽  
Recovery Efficiency ◽  
N Losses ◽  
Nitrogen Recovery Efficiency ◽  
Potential Losses ◽  
N Management

Lower nitrogen recovery efficiency (NRE) and negative environmental impacts caused by excessive nitrogen (N) fertilization threaten the sustainability of agriculture. Efficient and appropriate fertilization practices are extremely important to achieve higher crop yield with minimum N loss. A field microplot experiment was conducted in a wheat-maize rotation system in Shaanxi province, at North China Plain, using the 15N isotope tracer technique to qualify the different annual N managements in terms of crop yield, NRE, N distribution in plant-soil, and N losses to optimize the N management. The experiment included four N treatments: conventional practice with 510 kg ha−1 annually in four applications (N1), and three optimized N treatments, reducing N rate to 420 kg ha−1, adjusting topdressing fertilizer times and using slow-release fertilizer (SRF) (N2, N3, N4). The results showed that the grain yield and N uptake did not differ significantly among treatments. N from fertilizer taken up (Ndff) by wheat was not affected by N management; however, in maize, Ndff performed differently. Optimized treatments significantly decreased the Ndff as compared to N1 treatment. Furthermore, NRE of wheat and annual nitrogen recovery efficiency (annual NRE) did not differ among treatments in 2016 but significantly increased in 2017 compared to N1. Annual NRE in 2017 was similar to that obtained for wheat. For maize, optimized N managements decreased the NRE in N3 and N4 treatments of two years. Potential losses in wheat were also similar amongst treatments, but in maize, N3 and N4 had lower residual N in the soil’s top 60 cm but resulted in higher potential losses than N1 and N2. Overall, our results demonstrate that applying 420 kg N ha−1 annually in three applications and combining SRF and urea are effective to sustain crop yield, improve the efficiency of N usage by maize, and reduce N losses in this region.

scholarly journals How Nitrogen Supply Affects Growth and Nitrogen Uptake, Use Efficiency, and Loss from Citrus Seedlings

1996 ◽  
Vol 121 (1) ◽  
pp. 105-114 ◽  
Author(s):  
John D. Lea-Cox ◽  
James P. Syvertsen
Keyword(s):  
Plant Growth ◽  
N Uptake ◽  
Single Application ◽  
N Application ◽  
N Supply ◽  
N Concentration ◽  
Leaf N Concentration ◽  
Use Efficiency ◽  
Complete Nutrient Solution ◽  
Leaf N

We examined how N supply affected plant growth and N uptake, allocation and leaching losses from a fine sandy soil with four Citrus rootstock species. Seedlings of `Cleopatra' mandarin (Citrus reticulata Blanco) and `Swingle' citrumelo (C. paradisi × P. trifoliata) were grown in a glasshouse in 2.3-liter pots of Candler fine sand and fertilized weekly with a complete nutrient solution containing 200 mg N/liter (20 mg N/week). A single application of 15NH415NO3(17.8% atom excess 15N) was substituted for a normal weekly N application when the seedlings were 22 weeks old (day O). Six replicate plants of each species were harvested at 0.5, 1.5, 3.5, 7, 11, and 30 days after 15N application. In a second experiment, NH4 NO3 was supplied at 18,53, and 105 mg N/week to 14-week-old `Volkamer' lemon (C. volkameriana Ten. & Pasq.) and sour orange (C. aurantium L.) seedlings in a complete nutrient solution for 8 weeks. A single application of 15NH415NO3 (23.0% 15N) was substituted at 22 weeks (day 0), as in the first experiment, and seedlings harvested 3,7, and 31 days after 15N application. Nitrogen uptake and partitioning were similar among species within each rate, but were strongly influenced by total N supply and the N demand by new growth. There was no 15N retranslocation to new tissue at the highest (105 mg N/week) rate, but N supplies below this rate limited plant growth without short-term 15N reallocation from other tissues. Leaf N concentration increased linearly with N supply up to the highest rate, while leaf chlorophyll concentration did not increase above that at 53 mg N/week. Photosynthetic CO2 assimilation was not limited by N in this study; leaf N concentration exceeded 100 mmol·m-2 in all treatments. Thus, differences in net productivity at the higher N rates appeared to be a function of increased leaf area, but not of leaf N concentration. Hence, N use efficiency decreased significantly over the range of N supply, whether expressed either on a gas-exchange or dry weight basis. Mean plant 15N uptake efficiencies after 31 days decreased from 60% to 47% of the 15N applied at the 18,20, and 53 mg N/week rates to less than 33% at the 105 mg N/week rate. Leaching losses increased with N rate, with plant growth rates and the subsequent N requirements of these Citrus species interacting with residual soil N and potential leaching loss.

Ground Cover Rice Production System Increases Yield and Nitrogen Recovery Efficiency

2012 ◽  
Vol 104 (5) ◽  
pp. 1399-1407 ◽  
Author(s):  
Hang Qu ◽  
Hongbin Tao ◽  
Yueyue Tao ◽  
Meiju Liu ◽  
Kangrong Shen ◽  
...  
Keyword(s):  
Production System ◽  
Ground Cover ◽  
Rice Production ◽  
Nitrogen Recovery ◽  
Recovery Efficiency ◽  
Nitrogen Recovery Efficiency

scholarly journals Nitrogen Recovery Efficiency from Urea Treated with NSN Co-Polymer Applied to No-Till Corn

Agronomy ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 154 ◽  
Author(s):  
Pablo Barbieri ◽  
Hernán Sainz Rozas ◽  
Hernán Echeverría
Keyword(s):  
Grain Yield ◽  
Management Practices ◽  
Nitrogen Recovery ◽  
N Recovery ◽  
Recovery Efficiency ◽  
N Losses ◽  
Nitrogen Recovery Efficiency ◽  
No Till ◽  
Total Ammonia ◽  
N Recovery Efficiency

Nitrogen (N) rate increases used by many farmers produce a reduced or null effect on N recovery efficiency (RE) by crops. Therefore, management practices to reduce N losses and increase RE are necessary. Co-polymer maleic itaconic acid (NSN) have become available for use with urea and has shown potential in reducing N losses. The objective of this study was to evaluate the effectiveness of urea treated with NSN on grain yield and RE in a no-till corn. A field experiment was carried out at Balcarce, Argentina over three years, evaluated treatments were urea and urea + NSN at 120 N kg ha−1, and additional 0 N treatment was included. Urea + NSN was effective to reduce total ammonia volatilization losses, and the average of two years were 1.4 (1.1% to N applied) and 8.7 kg ha−1 (7.2% to N applied) for urea + NSN and urea, respectively. However, while grain yield and N grain removal were not affected by urea + NSN, the N rate significantly increased grain yield and N grain removal. Nitrogen recovery efficiency was not affected by urea + NSN, RE (average of three years) was 29.0% and 27.8% for urea and urea + NSN, respectively. In conclusion, there was no advantage of using urea treated with NSN in no-till corn overgrain yield, N grain removal, or RE.

scholarly journals Nitrogen recovery efficiency for corn intercropped with palisade grass

Bragantia ◽  
2018 ◽  
Vol 77 (4) ◽  
pp. 557-566
Author(s):  
Rodrigo Estevam Munhoz de Almeida ◽  
José Laércio Favarin ◽  
Rafael Otto ◽  
Henrique Franco ◽  
André Froes Borja Reis ◽  
...  
Keyword(s):  
Nitrogen Recovery ◽  
Recovery Efficiency ◽  
Nitrogen Recovery Efficiency
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