Response of potatoes to fertilizer application and nutrient use efficiency in Bulgaria

2021 ◽  
pp. 153-158
Author(s):  
I. Manolov ◽  
N. Shaban ◽  
S. Bistrichanov ◽  
M. Nikolova ◽  
B. Stalev ◽  
...  
Keyword(s):  
Nutrient Use Efficiency ◽  
Fertilizer Application ◽  
Nutrient Use ◽  
Use Efficiency

scholarly journals Timing Potassium Applications to Synchronize with Plant Demand

2020 ◽  
pp. 363-384
Author(s):  
V. K. Singh ◽  
B. S. Dwivedi ◽  
S. S. Rathore ◽  
R. P. Mishra ◽  
T. Satyanarayana ◽  
...  
Keyword(s):  
Crop Yields ◽  
Management Practice ◽  
Cropping Systems ◽  
Nutrient Use Efficiency ◽  
Fertilizer Application ◽  
High Yield ◽  
Farm Income ◽  
Nutrient Use ◽  
K Fertilizer ◽  
Use Efficiency

AbstractPotassium (K) demand by crops is almost as high as that of nitrogen (N) and plays a crucial role in many plant metabolic processes. Insufficient K application results in soil K mining, deficiency symptoms in crops, and decreased crop yields and quality. Crop K demands vary with crop types, growth patterns, nutrient needs at different physiological stages, and productivity. Science-based K application in crops needs to follow 4R Nutrient Stewardship to ensure high yield, improved farm income, and optimum nutrient use efficiency. Studies around the world report widespread K deficiency, ranging from tropical to temperate environments. Long-term experiments indicate significant yield responses to K application and negative K balances where K application is either omitted or applied suboptimally. Limited understanding of K supplementation dynamics from soil non-exchangeable K pools to the exchangeable and solution phases and over-reliance on native K supply to meet crop demand are major reasons for deficit of K supply to crops. Research on optimum timing of K fertilizer application in diverse climate–soil–crop systems is scarce. The common one-time basal K management practice is often not suitable to supply adequate K to the crops during peak demand phases. Besides, changes in crop establishment practices, residue retention, or fertigation require new research in terms of rate, time, or source of K application. The current review assesses the synchrony of K supply from indigenous soil system and from external sources vis-à-vis plant demand under different crops and cropping systems for achieving high yield and nutrient use efficiency.

scholarly journals Estimating Nutrient Uptake Requirements for Melon Based on the QUEFTS Model

Agronomy ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 207
Author(s):  
Meijuan Wen ◽  
Sicun Yang ◽  
Lin Huo ◽  
Ping He ◽  
Xinpeng Xu ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Nutrient Use Efficiency ◽  
Tropical Soils ◽  
Fertilizer Application ◽  
Linear Increase ◽  
Nutrient Requirements ◽  
Potential Yield ◽  
Nutrient Use ◽  
Fertilizer Recommendations ◽  
Use Efficiency

Imbalanced and excessive fertilizer application has resulted in low yields and reduced nutrient use efficiency for melon production in China. Estimating nutrient requirements is crucial for effectively developing site-specific fertilizer recommendations for increasing yield and profit while reducing negative environmental impacts. Relationships between the yield and nutrient uptake requirements of above-ground dry matter were assessed using 1127 on-farm observations (2000–2020) from melon production regions of China. The quantitative evaluation of fertility of tropical soils (QUEFTS) model was used to estimate nutrient requirements. It predicted a linear increase in yield at balanced nutrient uptake levels until the yield reached approximately 60–80% of the potential yield. In order to produce 1000 kg of fruit, 2.9, 0.4 and 3.2 kg/ha of N, P and K (7.2:1.0:7.8), respectively, were required for above-ground parts, while the corresponding nutrient internal efficiencies were 345.3, 2612.6 and 310.0 kg per kg N, P and K, respectively, whereas 1.4, 0.2 and 1.9 kg of N, P and K were required to replace nutrients removed after harvest. The corresponding fruit absorption rates were 47.0%, 59.5% and 58.2%, respectively. Field validation experiments confirmed the consistency between observed and simulated uptake rates, indicating that this model could estimate nutrient requirements. These findings will help develop fertilizer recommendations for improving melon yield and nutrient use efficiency.

scholarly journals Evaluation of blended fertilizer rates for improving production of food barley (Hordeum vulgare L.) in Semen Ari District, Southwestern Ethiopia

2022 ◽  
Vol 11 (2) ◽  
pp. 10-17
Author(s):  
M Malla ◽  
G Tesema ◽  
S Tesema ◽  
A Hegano ◽  
S Negash
Keyword(s):  
Grain Yield ◽  
Nutrient Use Efficiency ◽  
Fertilizer Application ◽  
Economic Returns ◽  
Net Benefit ◽  
Hordeum Vulgare L ◽  
Southwestern Ethiopia ◽  
Nutrient Use ◽  
Cropping Season ◽  
Use Efficiency

Depletion of soil fertility, depletion of macro- and micro-nutrients and soil organic matter and inappropriate and imbalanced fertilizer application are among the most important factors that reduces the food barley production in Ethiopia. Therefore, the experiment was conducted to evaluate NPSB blended fertilizer rate effect on improving production of food barley in Semen Ari District, Southwestern Ethiopia during main cropping season. Control, (142 NPS + 159 Urea) kg ha-1, (150 NPSB + 41 Urea) kg ha-1, (200 NPSB + 72 Urea) kg ha-1, (250 NPSB + 102 Urea) kg ha-1 and (100 NPSB + 161 Urea) kg ha-1 treatments were used for the experiment which laid out in RCBD following three replication with spacing of 20 cm between rows; and HB 1307 improved food barley seeds were drilled on prepared rows. Full dose of blended and potassium fertilizers were applied at planting time and urea was applied in two split. The result revealed that food barley responded well to application of N, P, S and B than the unfertilized one. Application of 100 kg ha-1 NPSB + 161 kg ha-1 Urea resulted in highest grain yield of 3806.3 kg ha-1, while the lowest grain yield of 1939.2 kg ha-1 was recorded from the nil. Moreover, the highest net benefit of 32124.56 ETB ha-1 and economic returns of 942.2% was recorded in response to application of 100 kg ha-1 NPSB + 161 kg ha-1 Urea. Application of 100 kg ha-1 NPSB + 161 kg ha-1 Urea gave 49.05% yield increment and 40.24% increment in economic return over the control. Therefore, we recommend application of 100 kg ha-1 NPSB + 161 kg ha-1 Urea for farmers and investor’s in study area and similar agro-ecologies as it was optimum for improving food barley production. Further studies and investigation should be done on plant nutrient uptake, nutrient use efficiency and over location. Int. J. Agril. Res. Innov. Tech. 11(2): 10-17, Dec 2021

scholarly journals Meticulous Overview on the Controlled Release Fertilizers

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Siafu Ibahati Sempeho ◽  
Hee Taik Kim ◽  
Egid Mubofu ◽  
Askwar Hilonga
Keyword(s):  
Controlled Release ◽  
Adverse Effects ◽  
Nutrient Use Efficiency ◽  
Nutrient Release ◽  
Fertilizer Application ◽  
Natural Polymers ◽  
Materials Engineering ◽  
Nutrient Use ◽  
Use Efficiency ◽  
Controlled Release Fertilizers

Owing to the high demand for fertilizer formulations that will exhaust the possibilities of nutrient use efficiency (NUE), regulate fertilizer consumption, and lessen agrophysicochemical properties and environmental adverse effects instigated by conventional nutrient supply to crops, this review recapitulates controlled release fertilizers (CRFs) as a cutting-edge and safe way to supply crops’ nutrients over the conventional ways. Essentially, CRFs entail fertilizer particles intercalated within excipients aiming at reducing the frequency of fertilizer application thereby abating potential adverse effects linked with conventional fertilizer use. Application of nanotechnology and materials engineering in agriculture particularly in the design of CRFs, the distinctions and classification of CRFs, and the economical, agronomical, and environmental aspects of CRFs has been revised putting into account the development and synthesis of CRFs, laboratory CRFs syntheses and testing, and both linear and sigmoid release features of CRF formulations. Methodical account on the mechanism of nutrient release centring on the empirical and mechanistic approaches of predicting nutrient release is given in view of selected mathematical models. Compositions and laboratory preparations of CRFs basing on in situ and graft polymerization are provided alongside the physical methods used in CRFs encapsulation, with an emphasis on the natural polymers, modified clays, and superabsorbent nanocomposite excipients.

Response of peaches to fertilizer application and nutrient use efficiency in Bulgaria

2018 ◽  
pp. 185-190
Author(s):  
I. Manolov ◽  
A. Yordanov ◽  
M. Apostolova ◽  
M. Nikolova ◽  
B. Stalev ◽  
...  
Keyword(s):  
Nutrient Use Efficiency ◽  
Fertilizer Application ◽  
Nutrient Use ◽  
Use Efficiency

scholarly journals FERTILIZER RECOMMENDATION SYSTEM FOR MELON BASED ON NUTRITIONAL BALANCE

2015 ◽  
Vol 39 (2) ◽  
pp. 498-511 ◽  
Author(s):  
José Aridiano Lima de Deus ◽  
Ismail Soares ◽  
Júlio César Lima Neves ◽  
José Francismar de Medeiros ◽  
Fábio Rodrigues de Miranda
Keyword(s):  
Recommendation System ◽  
Nutrient Use Efficiency ◽  
Fertilizer Application ◽  
Nutrient Balances ◽  
Time Of Application ◽  
Fertilizer Recommendation ◽  
Nutrient Use ◽  
Use Efficiency ◽  
Yellow Type ◽  
Nutritional Balance

Melon is one of the most demanding cucurbits regarding fertilization, requiring knowledge of soils, crop nutritional requirements, time of application, and nutrient use efficiency for proper fertilization. Developing support systems for decision-making for fertilization that considers these variables in nutrient requirement and supply is necessary. The objective of this study was parameterization of a fertilizer recommendation system for melon (Ferticalc-melon) based on nutritional balance. To estimate fertilizer recommendation, the system considers the requirement subsystem (REQ), which includes the demand for nutrients by the plant, and the supply subsystem (SUP), which corresponds to the supply of nutrients through the soil and irrigation water. After determining the REQtotal and SUPtotal, the system calculates the nutrient balances for N, P, K, Ca, Mg, and S, recommending fertilizer application if the balance is negative (SUP < REQ), but not if the balance is positive or zero (SUP ≥ REQ). Simulations were made for different melon types (Yellow, Cantaloupe, Galia and Piel-de-sapo), with expected yield of 45 t ha-1. The system estimated that Galia type was the least demanding in P, while Piel-de-sapo was the most demanding. Cantaloupe was the least demanding for N and Ca, while the Yellow type required less K, Mg, and S. As compared to other fertilizer recommendation methods adopted in Brazil, the Ferticalc system was more dynamic and flexible. Although the system has shown satisfactory results, it needs to be evaluated under field conditions to improve its recommendations.

scholarly journals Response of potatoes to fertilizer application and nutrient use efficiency in Bulgaria

2017 ◽  
Author(s):  
Ivan Manolov ◽  
Nidal Shaban ◽  
Sergey Bistrichanov ◽  
Margarita Nikolova ◽  
Boyan Stalev ◽  
...  
Keyword(s):  
Nutrient Use Efficiency ◽  
Fertilizer Application ◽  
Nutrient Use ◽  
Use Efficiency
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