scholarly journals Potassium chloride fertilization of potatoes: nutrient uptake rate and tuber yield of cultivars Ágata and Atlantic

2020 ◽  
Vol 38 (4) ◽  
pp. 400-406
Author(s):  
José Magno Q Luz ◽  
Roberta C Oliveira ◽  
Regina Maria Q Lana ◽  
João Ricardo R Silva ◽  
Tiyoko Nair H Rebouças
Keyword(s):  
Experimental Design ◽  
Uptake Rate ◽  
Tuber Yield ◽  
Application Rate ◽  
Potassium Fertilizer ◽  
Fertilizer Use ◽  
Use Efficiency ◽  
Nutrient Uptake Rate ◽  
Cultivar Atlantic ◽  
The Relationship

ABSTRACT Potassium (K) is the nutrient taken up in the greatest quantity by the potato plant. Obtaining information about the relationship between tuber yield and K application rate allows improvements in fertilizer use efficiency. We aimed to evaluate the variation in potassium fertilizer doses in uptake rate of other nutrients and in potato tuber yield. The experiments were carried out in Unaí-MG testing cultivars Ágata and Atlantic and in Mucugê-BA evaluating cultivar Ágata. The experimental design used was randomized blocks. We studied the rates of 0; 70; 110; 220, and 450 kg ha-1 K2O. The increase in K rate reduced the levels of S, Ca, Mg and B in Atlantic-Unaí, Ca, Mg, Zn and B in Ágata-Unaí and S, Fe and B in Ágata-Mucugê. The cultivar Atlantic-Unaí did not respond to the increase of potassium fertilizer dose, with a total of 32.3 to 37 t ha-1. Cultivars Ágata-Unaí and Ágata-Mucugê responded to rates estimated at 225 and 166 kg ha-1 K2O with the highest productivities of 53.9 and 56.2 t ha-1, respectively.

scholarly journals Predicting microbial growth dynamics in response to nutrient availability

2021 ◽  
Vol 17 (3) ◽  
pp. e1008817
Author(s):  
Olga A. Nev ◽  
Richard J. Lindsay ◽  
Alys Jepson ◽  
Lisa Butt ◽  
Robert E. Beardmore ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Uptake Rate ◽  
Nutrient Concentration ◽  
Microbial Growth ◽  
Biomass Yield ◽  
Growth Parameters ◽  
Growth Dynamics ◽  
Microbial Dynamics ◽  
Nutrient Uptake Rate ◽  
The Relationship

Developing mathematical models to accurately predict microbial growth dynamics remains a key challenge in ecology, evolution, biotechnology, and public health. To reproduce and grow, microbes need to take up essential nutrients from the environment, and mathematical models classically assume that the nutrient uptake rate is a saturating function of the nutrient concentration. In nature, microbes experience different levels of nutrient availability at all environmental scales, yet parameters shaping the nutrient uptake function are commonly estimated for a single initial nutrient concentration. This hampers the models from accurately capturing microbial dynamics when the environmental conditions change. To address this problem, we conduct growth experiments for a range of micro-organisms, including human fungal pathogens, baker’s yeast, and common coliform bacteria, and uncover the following patterns. We observed that the maximal nutrient uptake rate and biomass yield were both decreasing functions of initial nutrient concentration. While a functional form for the relationship between biomass yield and initial nutrient concentration has been previously derived from first metabolic principles, here we also derive the form of the relationship between maximal nutrient uptake rate and initial nutrient concentration. Incorporating these two functions into a model of microbial growth allows for variable growth parameters and enables us to substantially improve predictions for microbial dynamics in a range of initial nutrient concentrations, compared to keeping growth parameters fixed.

scholarly journals CROP FERTILIZER USE EFFICIENCY ANALYSIS (CFE): A Tool in identifying appropriate planting materials of coconut in different agro climatic conditions

CORD ◽  
1996 ◽  
Vol 12 (02) ◽  
pp. 34
Author(s):  
S.S. MAGAT S.S. MAGAT
Keyword(s):  
The Philippines ◽  
Climatic Conditions ◽  
Hybrid Vigour ◽  
Fertilizer Use Efficiency ◽  
Fertilizer Use ◽  
Use Efficiency ◽  
Growing Conditions ◽  
Planting Materials ◽  
Relationship Of ◽  
The Relationship

Nine (9) sites with different growing conditions used in the Regional Testing of Promising Coconut Hybrids and Cultivars in the Philippines or MULTILOC Project (1985‑1996) was subjected to the Crop Fertilizer Use Efficiency (CFE) Analysis. Two CFE indices were used CFEn = nut yield/kg fertilizer applied (per tree) and CFE X = kg copra yield kg fertilizers applied (per tree).   To a great extent, crop fertilizer use efficiency (CFE) ofsuperior hybrids grown in similar environments and appied with same moderate rates offertilizers have higher efficiency of converting the appliedfertilizers to economic yield, nuts or copra (measured in terms of CFEn and CFEc) compared to tall varielies tested in all MULTILOC sites (dry, intermediate and wet growing zone) at n ine years ftom field‑planting (FP). The CFEs, CFEn (nut‑based) at nine sites clearly differed in ternu of the first (best) five entries with highest CFE values. Explanation for this observation deserves further study, looking into the relationship of hybrid vigour (heterosis), crop morphology, physiology and yield.

scholarly journals Correction of Potassium Fertigation Rate of Apple Tree (Malus domestica Borkh.) in Central Russia during the Growing Season

Plants ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1366
Author(s):  
Andrei I. Kuzin ◽  
Natalia Ya. Kashirskaya ◽  
Anna M. Kochkina ◽  
Alexey V. Kushner
Keyword(s):  
Growing Season ◽  
Application Rate ◽  
Potassium Fertilizer ◽  
Crop Load ◽  
Yield Increase ◽  
Central Russia ◽  
Soil Calcium ◽  
Application Rates ◽  
Significant Yield ◽  
The Relationship

The proper use of potassium fertilizer can stimulate a significant yield increase. However, the application of excessively high rates of potassium can reduce the availability of soil calcium for apple trees. The potassium fertigation rate must meet the apple tree’s requirements so that the applied fertilizers can be absorbed by the roots as much as possible. Crop load in apple orchards sometimes varies significantly in different years. The potassium content in apple fruits is relatively high, and the maximum requirement for this nutrient occurs when fruits grow and ripen. Different crop loads at that time mean the various demands of trees and need for changing application rates for this nutrient. The investigation was carried out in the experimental orchard of I.V. Michurin Federal Scientific Centre (Michurinsk, Russia) in 2016 and 2017 (52.885131, 40.465613). We studied seasonal changes of potassium and calcium contents in soil, fruits, and leaves and their relationship with yield during the research. We paid much attention to the potassium rate shift on its content in leaves and fruits and cultivars “Lobo” and “Zhigulevskoye” yield. If the potassium application rate changes according to the actual crop load, it stimulates the yield growth or (if the crop load was relatively low) the reduction of the rate did not lower the productivity. Moreover, we studied the relationship between potassium and calcium nutrition. The decrease in potassium fertigation rate increased the availability of soil calcium. It was the reason for fruit calcium concentration enlargement and mitigation of the K/Ca ratio. We also specified some parameters for soil–leaf diagnosis for potassium nutrition during the growing season.

Effects of straw strip mulching on furrows and planting in ridges on water use efficiency and tuber yield in dryland potato

2019 ◽  
Vol 45 (5) ◽  
pp. 714
Author(s):  
Yu-Zhang CHEN ◽  
Hui-Hui TIAN ◽  
Ya-Wei LI ◽  
Yu-Wei CHAI ◽  
Rui LI ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Tuber Yield ◽  
Use Efficiency

scholarly journals Optimizing Grain Yield and Water Use Efficiency Based on the Relationship between Leaf Area Index and Evapotranspiration

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 313
Author(s):  
Guoqiang Zhang ◽  
Bo Ming ◽  
Dongping Shen ◽  
Ruizhi Xie ◽  
Peng Hou ◽  
...  
Keyword(s):  
Grain Yield ◽  
Water Use Efficiency ◽  
Leaf Area Index ◽  
Water Use ◽  
Plant Density ◽  
Maize Yield ◽  
Area Index ◽  
Irrigation Level ◽  
Use Efficiency ◽  
The Relationship

Achieving optimal balance between maize yield and water use efficiency is an important challenge for irrigation maize production in arid areas. In this study, we conducted an experiment in Xinjiang China in 2016 and 2017 to quantify the response of maize yield and water use to plant density and irrigation schedules. The treatments included four irrigation levels: 360 (W1), 480 (W2), 600 (W3), and 720 mm (W4), and five plant densities: 7.5 (D1), 9.0 (D2), 10.5 (D3), 12.0 (D4), and 13.5 plants m−2 (D5). The results showed that increasing the plant density and the irrigation level could both significantly increase the leaf area index (LAI). However, LAI expansion significantly increased evapotranspiration (ETa) under irrigation. The combination of irrigation level 600 mm (W3) and plant density 12.0 plants m−2 (D4) produced the highest maize yield (21.0–21.2 t ha−1), ETa (784.1–797.8 mm), and water use efficiency (WUE) (2.64–2.70 kg m−3), with an LAI of 8.5–8.7 at the silking stage. The relationship between LAI and grain yield and evapotranspiration were quantified, and, based on this, the relationship between water use and maize productivity was analyzed. Moreover, the optimal LAI was established to determine the reasonable irrigation level and coordinate the relationship between the increase in grain yield and the decrease in water use efficiency.

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