scholarly journals Physiological efficiency under different nitrogen nutrition conditions and relationship with photosynthetic N-use efficiency in Myanmar local rice varieties (Oryza sativa L.)

10.5109/17801 ◽  
2010 ◽  
Vol 55 (1) ◽  
pp. 61-66
Author(s):  
Khin Thanda Win ◽  
Toshihiro Mochizuki
Keyword(s):  
Oryza Sativa ◽  
Nitrogen Nutrition ◽  
Oryza Sativa L ◽  
N Use Efficiency ◽  
Rice Varieties ◽  
Physiological Efficiency ◽  
Use Efficiency ◽  
N Use

scholarly journals Pengaruh pemupukan N terhadap serapan dan efisiensi penggunaan N, serta hasil padi hibrida

Jurnal Agro ◽  
2022 ◽  
Vol 8 (2) ◽  
pp. 262-273
Author(s):  
Risqa Naila Khusna Syarifah ◽  
Zulfa Ulinuha ◽  
Purwanto Purwanto
Keyword(s):  
Hybrid Rice ◽  
Block Design ◽  
N Uptake ◽  
N Use Efficiency ◽  
Optimum Dose ◽  
Rice Varieties ◽  
Randomized Block Design ◽  
Use Efficiency ◽  
N Use

Pemupukan N pada padi hibrida menjadi krusial mengingat varietas padi hibrida sangat responsif, sehingga harus diketahui dosis yang tepat untuk menghasilkan produksi yang tinggi. Penelitian ini bertujuan untuk mengkaji pengaruh dosis N terhadap serapan N, efisiensi penggunaan N, dan hasil padi hibrida. Penelitian menggunakan Rancangan Acak Kelompok yang diulang tiga kali. Faktor pertama adalah varietas padi hibrida yang terdiri dari Varietas Mapan P05, Varietas SL-8 SHS Sterling, dan Varietas Intani 602. Faktor kedua adalah dosis pemupukan N yang terdiri dari kontrol tanpa pemupukan N, dosis N 100 kg ha-1, dan dosis N 200 kg ha-1. Terdapat respon yang beragam antar varietas padi hibrida terhadap taraf pemupukan N, Serapan N, efisiensi penggunaan N tertinggi yang dihasilkan oleh varietas Intani 602 masing-masing sebesar 138,57 %, dan 36,13%. Serapan N tanaman padi tertinggi dicapai pada dosis N 100 kg ha-1, dan efisiensi penggunaan N tertinggi pada dosis N 200 kg ha-1. Hasil gabah tertinggi dicapai pada varietas Mapan P05 sebesar 7,42 t ha-1, dan dosis pemupukan N 100 kg ha-1 memberikan hasil tertinggi sebesar 7,47 t ha-1. Implikasi dari penelitian ini bahwa dosis nitrogen 100 kg ha-1 dapat menjadi acuan sebagai dosis pemupukan N varietas padi hibrida di Indonesia. Hybrid rice is responsive to nitrogen, so it’s necessary to find the optimum dose to optimize the production. The  aim of this research was to examine the effect of nitrogen on N uptake, N use efficiency, and yield of hybrid rice. This study used a randomized block design with three replications. The first factor consisted of the  Mapan P05 variety, the SL-8 SHS Sterling variety, and Intani 602 variety. The second factor was Nitrogen dosage consisted of control, 100 kg ha-1, and 200 kg ha-1. There were various responses among hybrid rice varieties to the level of fertilization. The highest N uptake and N use efficiency was achieved in the Intani 602 variety at 138.57% and 36.13%, respectively. The highest N uptake was achieved at 100 kg ha-1 of N, and the highest N use efficiency was at 200 kg ha-1. The highest yield was achieved in the Mapan P05 variety (7.42 t ha-1), and the dose of N at 100 kg ha-1 gave the highest yield (7.47 t ha-1). The implication of this research is that the nitrogen dose of 100 kg ha-1 can be used as a reference for hybrid rice varieties fertilizer in Indonesia.

scholarly journals ​Nutrient (Nitrogen, Phosphorous and Potassium) Uptake Capacity and Efficiency of different Elite Rice (Oryza sativa L.) Varieties under Delayed Planting Conditions

2021 ◽  
Author(s):  
Santrupta Manmath Satapathy ◽  
V.K. Srivastava ◽  
Suraj Gond ◽  
Prasanta Kumar Majhi
Keyword(s):  
Oryza Sativa ◽  
Agricultural Research ◽  
Oryza Sativa L ◽  
Nutrient Use Efficiency ◽  
Nutrient Content ◽  
Uptake Capacity ◽  
Rice Varieties ◽  
Nutrient Use ◽  
Main Plot ◽  
Use Efficiency

Background: The present investigation was concentrated to determine the nutrient uptake capacity of different varieties of rice (Oryza sativa L.) under delayed planting condition. The purpose of the study is to evaluate the nutrient content in straw and grain in different varieties of rice to understand the nutrient acquisition capacity. Methods: The experiment was conducted during kharif-2018 in a split plot design with three replications at Agricultural Research Farm, BHU, Varanasi with a combination of four rice varieties (HUR-3022, DRR-44, HUR-4-3 and HUR-105) as subplot factor and three dates of planting (06/09/2018, 13/08/2018 and 20/08/2018) as main-plot factor. Result: Among the varieties, DRR-44 was observed efficient for N, P and K absorption under timely planting conditions and recorded higher N content (1.01%) than HUR-3022 (0.91%) and HUR-105 (0.86%). The P (0.45%) and K (0.29%) content were observed highest for the variety DRR-44 on the first date of planting (06/08/2018). Maximum N, P and K uptake by grain and straw were recorded in DRR-44 followed by HUR-3022 and HUR-105. DRR-44 was also the highest grain and straw yielder. Thus, improved varieties of rice with higher nutrient use efficiency should be the priority for quality and higher yield of straw and grain of the crop.

Whole-plant growth and N allocation in transgenic rice plants with decreased content of ribulose-1,5-bisphosphate carboxylase under different CO2 partial pressures

2000 ◽  
Vol 27 (1) ◽  
pp. 1 ◽  
Author(s):  
Amane Makino ◽  
Masayo Harada ◽  
Kentaro Kaneko ◽  
Tadahiko Mae ◽  
Takiko Shimada ◽  
...  
Keyword(s):  
Transgenic Rice ◽  
Oryza Sativa L ◽  
Early Stage ◽  
N Use Efficiency ◽  
Wild Type Plant ◽  
Wild Type ◽  
Bisphosphate Carboxylase ◽  
Whole Plant ◽  
Use Efficiency ◽  
N Use

Growth of transgenic rice (Oryza sativa L.) with an antisense gene to the small subunit of Rubisco was analysed under 36 and 100 Pa CO2 during a 14-h photoperiod (1000 mol quanta m–2 s–1). Two lines of the antisense plants were used; one with 65% wild-type Rubisco and the other with 40% wild-type Rubisco. The plants were grown hydroponically for 70 d. The final biomass of the antisense plants grown in 36 Pa CO2 was much smaller than that of the wild-type plant. However, several compen-sation phenomena were found in the antisense plants. Increased biomass allocation to leaf blades and preferential N investment in leaf blades were observed. Leaf senescence was also delayed. Elevated CO2 levels up to 100 Pa caused the antisense plants to achieve a size similar to that of the wild-type plant. However, although the antisense plant with 65% wild-type Rubisco was selected as a plant with optimal Rubisco content for CO2 -saturated photosynthesis, its final biomass was not greater than that of the wild-type plant. This may have been caused by a relatively strong Rubisco-antisense effect during the early stage of growth (21–42 d). N-use efficiency for growth after d 42 was greater in the selected antisense plant. Thus, improvement of N-use efficiency at the level of a single leaf did not necessarily lead to greater production of biomass at the whole-plant level.

scholarly journals Organic nitrogen nutrition: LHT1.2 protein from hybrid aspen (Populus tremula L. x tremuloides Michx) is a functional amino acid transporter and a homolog of Arabidopsis LHT1

2021 ◽  
Author(s):  
Regina Gratz ◽  
Iftikhar Ahmad ◽  
Henrik Svennerstam ◽  
Sandra Jämtgård ◽  
Jonathan Love ◽  
...  
Keyword(s):  
Nitrogen Nutrition ◽  
Populus Tremula ◽  
N Use Efficiency ◽  
Hybrid Aspen ◽  
Boreal Ecosystems ◽  
N Nutrition ◽  
Genes Encoding ◽  
Use Efficiency ◽  
Uptake Studies ◽  
N Use

Abstract The contribution of amino acids (AAs) to soil nitrogen (N) fluxes is higher than previously thought. The fact that AA uptake is pivotal for N nutrition in boreal ecosystems highlights plant AA transporters as key components of the N cycle. At the same time, very little is known about AA transport and respective transporters in trees. Tree genomes may contain thirteen or more genes encoding the LYSINE HISTIDINE TRANSPORTER (LHT) family proteins, and this complicates the study of their significance for tree N use efficiency. With the strategy of obtaining a tool to study N use efficiency, our aim was to identify and characterize a relevant AA transporter in hybrid aspen (Populus tremula L. x tremuloides Michx.). We identified PtrLHT1.2, the closest homolog of Arabidopsis thaliana AtLHT1, which is expressed in leaves, stems and roots. Complementation of a yeast AA uptake mutant verified the function of PtrLHT1.2 as an AA transporter. Furthermore, PtrLHT1.2 was able to fully complement the phenotypes of the Arabidopsis AA uptake mutant lht1 aap5, including early leaf senescence-like phenotype, reduced growth, decreased plant N levels and reduced root AA uptake. AA uptake studies finally showed that PtrLHT1.2 is a high affinity transporter for neutral and acidic AAs. Thus, we identified a functional AtLHT1 homolog in hybrid aspen, which harbors the potential to enhance overall plant N levels and hence increase biomass production. This finding provides a valuable tool for N nutrition studies in trees and opens new avenues to optimizing tree N use efficiency.

Variation in yield, N uptake and N use efficiency of medium and late duration rice varieties

2006 ◽  
Vol 144 (1) ◽  
pp. 69-83 ◽  
Author(s):  
DILLIP KUMAR SWAIN ◽  
BURLA CHANDRA BHASKAR ◽  
PRAMILA KRISHNAN ◽  
KURKURI SRINIVASA RAO ◽  
SANGRAM KESHARI NAYAK ◽  
...  
Keyword(s):  
Grain Yield ◽  
N Uptake ◽  
N Use Efficiency ◽  
Curvilinear Relationship ◽  
Grain Production ◽  
Rice Varieties ◽  
N Content ◽  
Use Efficiency ◽  
The Relationship ◽  
N Use

Field experiments were conducted at the village Kasiadihi, Dhenkanal district, Orissa, India during wet seasons 2001, 2002 and 2003 under non water-stressed conditions (0–25 cm standing water) to assess variability in N uptake and utilization by medium and late duration rice varieties. The N rates were 0, 40, 80 and 120 kg N/ha applied as urea in four equal splits at transplanting, active tiller initiation, panicle initiation and flowering stages. The grain yield response was up to 80 kg N/ha. The optimum grain yield attainable by the efficient medium duration varieties was 4·5 t/ha. The N efficient late duration varieties produced optimum grain yield of 5·8 t/ha. The relationship for total dry matter and grain yield production between N fertilized (40, 80 and 120 kg N/ha) and non-fertilized treatments were all significant, suggesting cultivar selection under optimum N fertilized conditions. The difference in optimum yield of the medium and late duration varieties was due to the differences in the amount of N uptake and its use efficiency by the plant for grain production. There was a curvilinear relationship between grain yield and N use efficiency for grain production. The relationship between N use efficiency for grain production and N contents of leaf, stem and grain at maturity was quadratic. The optimum plant N use efficiency of medium duration varieties was 49 kg grain/kg N uptake, achieved with leaf, stem and grain N contents of 10, 8 and 14 g/kg, respectively, at maturity. For late duration varieties, the optimum plant N use efficiency was 68 kg grain/kg N uptake and it was maintained with leaf and stem N content of 4·0 g/kg each and grain N content of 9·0 g/kg at maturity. The N content in plant organs could be the selection guide used to obtain efficient rice varieties.

scholarly journals Optimization of Topdressing for Winter Wheat by Accurate Growth Monitoring and Improved Production Estimation

2021 ◽  
Vol 13 (12) ◽  
pp. 2349
Author(s):  
Jingchun Ji ◽  
Jianli Liu ◽  
Jingjing Chen ◽  
Yujie Niu ◽  
Kefan Xuan ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Crop Production ◽  
Optimization Method ◽  
Growth Potential ◽  
N Use Efficiency ◽  
Growth Monitoring ◽  
Aerial Vehicle ◽  
Use Efficiency ◽  
Improved Model ◽  
N Use

Topdressing accounts for approximately 40% of the total nitrogen (N) application of winter wheat on the Huang-Huai-Hai Plain in China. However, N use efficiency of topdressing is low due to the inadaptable topdressing method used by local farmers. To improve the N use efficiency of winter wheat, an optimization method for topdressing (THP) is proposed that uses unmanned aerial vehicle (UAV)-based remote sensing to accurately acquire the growth status and an improved model for growth potential estimation and optimization of N fertilizer amount for topdressing (NFT). The method was validated and compared with three other methods by a field experiment: the conventional local farmer’s method (TLF), a nitrogen fertilization optimization algorithm (NFOA) proposed by Raun and Lukina (TRL) and a simplification introduced by Li and Zhang (TLZ). It shows that when insufficient basal fertilizer was provided, the proposed method provided as much NFT as the TLF method, i.e., 25.05% or 11.88% more than the TRL and TLZ methods and increased the yields by 4.62% or 2.27%, respectively; and when sufficient basal fertilizer was provided, the THP method followed the TRL and TLZ methods to reduce NFT but maintained as much yield as the TLF method with a decrease of NFT by 4.20%. The results prove that THP could enhance crop production under insufficient N preceding conditions by prescribing more fertilizer and increase nitrogen use efficiency (NUE) by lowering the fertilizer amount when enough basal fertilizer is provided.

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