Dynamics of nitrogen content in the branches of the apple trees

2020 ◽  
Vol 60 (1) ◽  
pp. 42-47
Author(s):  
L. V. Grigoreva ◽  
E. V. Gorlova
Keyword(s):  
Nitrogen Content ◽  
Positive Impact ◽  
Growing Season ◽  
Apple Orchard ◽  
Nitrogen Fertilizers ◽  
Apple Trees ◽  
The Future ◽  
Kjeldahl Method ◽  
Tissue Aging ◽  
Branch Wood

The aim of the conducted research was to study the dynamics of nitrogen content in various organs of apple trees (spurs, annual shoots, branch wood) in the fruit-bearing orchard in different periods of the growing season. Nitrogen content was monitored at the end of the growing season (November), during the beginning of the growing season (April) and during the period of active fruit growth (July). The research was carried out in an intensive apple orchard in the Tambov region on the next varieties: ‘Antonovka Obyknivennaya’, ‘Zhigulevskoye’, ‘Orlik’, ‘Spartan’, ‘Bogatyr’, grafted on rootstock 62-396. The nitrogen content was determined in dried and crushed plant material according to the Kjeldahl method. As a result of research, it was found that the high content of nitrogen in the wood of apple trees was recorded in the autumn period, in the future the level of nitrogen decreased and reached the minimum value by the spring. In summertime, the content of nitrogen in 2-4 and 5-6 years old wood of all studied varieties increased in comparison to autumn and spring. The largest content of nitrogen was found in wood of ‘Zhigulevskoye’ variety was 0,82 % (2-4 years old wood) and 0,86 % (5-6 years old). This is more than in autumn on 0,30 % and 0,24 %, and in spring on 0,39 % and 0,35 % respectively. Based on the data obtained, the content of this nutrient in the apple tree wood in the autumn could be corrected by the application of nitrogen fertilizers during growing season, which directly affect the accumulation of reserve substances and tissue aging. It makes a positive impact on the development of the future crop and the preparation of trees for the winter.

scholarly journals Analysis of the yield of selected apple varieties in the first years after the planting the orchard

2018 ◽  
Vol 50 (3) ◽  
pp. 241-249
Author(s):  
Weronika Masłowska ◽  
Daniel Liberacki
Keyword(s):  
Growing Season ◽  
Apple Orchard ◽  
First Year ◽  
Atmospheric Conditions ◽  
Average Yield ◽  
Apple Trees ◽  
Apple Varieties ◽  
Cultivation Period ◽  
The Impact

Abstract Analysis of the yield of selected apple varieties in the first years after the planting the orchard. The aim of the paperwork was to analyze the impact of innovative apple orchard cultivation on the yield of selected apple varietes: Galaval, Buckeye Gala, Golden Reinders, Grani and Fuji. The research ware conducted on orchard located in Gutowo Małe, Września county, in the Wielkopolskie province. The orchard was established in May 2016. The area of orchard is 4.0 ha and there are 7,600 annual and biennial apple seedlings. The analyzed apple varieties are used in foreign orchards. Cutting and forming trees is done in a different way, from the way it was done in traditional orchards. The purpose of this is to achieve better conditions of sunlight, which significantly affect the color of the fruit. Good coloring of fruit is one of the factors determining the profitability of crop. The aim of the study is to assess, the quality and quantity of yield of apple varieties, which have not been grown in Poland yet. The first harvest was recorded in 2017. The early cultivation period was characterized by the lack of irrigation. Atmospheric conditions of the studied area had a significant effect on the yield of apple trees. The considered year 2017 was defined as wet with a precipitation of 659 mm higher by 77 mm than the average over multiannual (2007-2017), while the temperature was higher by 0.4°C than the average over the period from 2007 to 2017. During the growing season, the sum of precipitation was 346 mm and slightly exceeded the long-term average. After the analysis of the harvest, it was found that the Fuji variety yielded best. Despite the dumping of more than half of the fruits from each tree, in order to improve their quality, the average yield was 15.0 t·ha-1, in the first year of yielding.

scholarly journals Estimating the Leaf Nitrogen Content with a New Feature Extracted from the Ultra-High Spectral and Spatial Resolution Images in Wheat

2021 ◽  
Vol 13 (4) ◽  
pp. 739
Author(s):  
Jiale Jiang ◽  
Jie Zhu ◽  
Xue Wang ◽  
Tao Cheng ◽  
Yongchao Tian ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Precision Agriculture ◽  
Field Experiments ◽  
Mean Squared Error ◽  
Growing Season ◽  
Leaf Nitrogen ◽  
Textural Analysis ◽  
Hyperspectral Images ◽  
Leaf Nitrogen Content ◽  
New Feature

Real-time and accurate monitoring of nitrogen content in crops is crucial for precision agriculture. Proximal sensing is the most common technique for monitoring crop traits, but it is often influenced by soil background and shadow effects. However, few studies have investigated the classification of different components of crop canopy, and the performance of spectral and textural indices from different components on estimating leaf nitrogen content (LNC) of wheat remains unexplored. This study aims to investigate a new feature extracted from near-ground hyperspectral imaging data to estimate precisely the LNC of wheat. In field experiments conducted over two years, we collected hyperspectral images at different rates of nitrogen and planting densities for several varieties of wheat throughout the growing season. We used traditional methods of classification (one unsupervised and one supervised method), spectral analysis (SA), textural analysis (TA), and integrated spectral and textural analysis (S-TA) to classify the images obtained as those of soil, panicles, sunlit leaves (SL), and shadowed leaves (SHL). The results show that the S-TA can provide a reasonable compromise between accuracy and efficiency (overall accuracy = 97.8%, Kappa coefficient = 0.971, and run time = 14 min), so the comparative results from S-TA were used to generate four target objects: the whole image (WI), all leaves (AL), SL, and SHL. Then, those objects were used to determine the relationships between the LNC and three types of indices: spectral indices (SIs), textural indices (TIs), and spectral and textural indices (STIs). All AL-derived indices achieved more stable relationships with the LNC than the WI-, SL-, and SHL-derived indices, and the AL-derived STI was the best index for estimating the LNC in terms of both calibration (Rc2 = 0.78, relative root mean-squared error (RRMSEc) = 13.5%) and validation (Rv2 = 0.83, RRMSEv = 10.9%). It suggests that extracting the spectral and textural features of all leaves from near-ground hyperspectral images can precisely estimate the LNC of wheat throughout the growing season. The workflow is promising for the LNC estimation of other crops and could be helpful for precision agriculture.

scholarly journals Modeling the Impact of Climate Changes on Crop Yield: Irrigated vs. Non-Irrigated Zones in Mississippi

2021 ◽  
Vol 13 (12) ◽  
pp. 2249
Author(s):  
Sadia Alam Shammi ◽  
Qingmin Meng
Keyword(s):  
Climate Change ◽  
Crop Yield ◽  
Crop Yields ◽  
Negative Impact ◽  
Positive Impact ◽  
Information Criterion ◽  
Growing Season ◽  
Maximum Temperature ◽  
Linear Regression Models ◽  
The Impact

Climate change and its impact on agriculture are challenging issues regarding food production and food security. Many researchers have been trying to show the direct and indirect impacts of climate change on agriculture using different methods. In this study, we used linear regression models to assess the impact of climate on crop yield spatially and temporally by managing irrigated and non-irrigated crop fields. The climate data used in this study are Tmax (maximum temperature), Tmean (mean temperature), Tmin (minimum temperature), precipitation, and soybean annual yields, at county scale for Mississippi, USA, from 1980 to 2019. We fit a series of linear models that were evaluated based on statistical measurements of adjusted R-square, Akaike Information Criterion (AIC), and Bayesian Information Criterion (BIC). According to the statistical model evaluation, the 1980–1992 model Y[Tmax,Tmin,Precipitation]92i (BIC = 120.2) for irrigated zones and the 1993–2002 model Y[Tmax,Tmean,Precipitation]02ni (BIC = 1128.9) for non-irrigated zones showed the best fit for the 10-year period of climatic impacts on crop yields. These models showed about 2 to 7% significant negative impact of Tmax increase on the crop yield for irrigated and non-irrigated regions. Besides, the models for different agricultural districts also explained the changes of Tmax, Tmean, Tmin, and precipitation in the irrigated (adjusted R-square: 13–28%) and non-irrigated zones (adjusted R-square: 8–73%). About 2–10% negative impact of Tmax was estimated across different agricultural districts, whereas about −2 to +17% impacts of precipitation were observed for different districts. The modeling of 40-year periods of the whole state of Mississippi estimated a negative impact of Tmax (about 2.7 to 8.34%) but a positive impact of Tmean (+8.9%) on crop yield during the crop growing season, for both irrigated and non-irrigated regions. Overall, we assessed that crop yields were negatively affected (about 2–8%) by the increase of Tmax during the growing season, for both irrigated and non-irrigated zones. Both positive and negative impacts on crop yields were observed for the increases of Tmean, Tmin, and precipitation, respectively, for irrigated and non-irrigated zones. This study showed the pattern and extent of Tmax, Tmean, Tmin, and precipitation and their impacts on soybean yield at local and regional scales. The methods and the models proposed in this study could be helpful to quantify the climate change impacts on crop yields by considering irrigation conditions for different regions and periods.

Make the change

2021 ◽  
Vol 23 (3) ◽  
pp. S14-S15
Author(s):  
Claire Hewson
Keyword(s):  
Global Warming ◽  
Positive Impact ◽  
Natural World ◽  
The Future

Against the background of the pandemic and global warming, the theme of The Big Draw 2021, an art festival which takes place this month, is ‘Make the change’. The focus is to explore the ways we look after each other and the natural world to make a positive impact on the future.

scholarly journals Effect of Different Growing Systems of Apple on Trunk and Branch Diseases and Pests

2012 ◽  
Vol 40 (2) ◽  
pp. 159 ◽  
Author(s):  
Maria BOROVINOVA ◽  
Vilina PETROVA ◽  
Svetla MANEVA
Keyword(s):  
Experimental Period ◽  
Apple Orchard ◽  
Mineral Fertilizers ◽  
Conventional System ◽  
Apple Trees ◽  
Pests And Diseases ◽  
Botryosphaeria Obtusa ◽  
Apple Production ◽  
The Mean ◽  
Important Disease

The presented study aimed to determine apples trunk and branch diseases and pests in three growing systems conventional, integrated and biological (organic). The investigations were made on an experimental apple orchard (1 ha) of the Institute of Agriculture at Kyustendil, Southwest Bulgaria in four consecutive years from 2007 to 2010. Three scab resistant cultivars Prima, Florina and Erwin Baur grafted on rootstocks MM106 were planted in 1996. The orchard was divided into four plots. One plot was treated conventionally with a normal pesticide programme, two plots were treated integrated according to the general principles, rules and standards of integrated apple production and one plot for biological (organic). The monitoring of pests and diseases and assessment of their density were done every two weeks. It was established that during the experimental period important disease and pests on apple trees in different growing systems were black rot Botryosphaeria obtusa, apple clearwig moth Synanthedon myopaeformis and shorthole borer Scolytus rugulosus. The damages by trunk and branch diseases and pests on apple were considerable higher in biological growing system. The mean rate of attack of cultivar Erwin Baur by Botryosphaeria obtusa in biological and conventional growing systems was 52.35% and 4.65%, respectively. The percentage of damaged by Scolytus rugulosus trunk and branch area per tree reach to 58.74 in biological and 0.23 in conventional system. Reduced vitality of apple trees growing with out pesticides and mineral fertilizers in biological growing system was the reason for strong infection of Botryosphaeria obtusa and attack of Synanthedon myopaeformis and Scolytus rugulosus.

scholarly journals Calcium nitrate and ammonium nitrate limestone as sources of nitrogen for oats and barley

1961 ◽  
Vol 33 (1) ◽  
pp. 159-168
Author(s):  
Pentti Hänninen ◽  
Armi Kaila
Keyword(s):  
Ammonium Nitrate ◽  
Nitrogen Content ◽  
Calcium Nitrate ◽  
Field Trials ◽  
The Other ◽  
Nitrogen Fertilizers ◽  
Malting Barley ◽  
Growing Period ◽  
Significant Difference ◽  
Cent Level

Calcium nitrate and ammonium nitrate limestone (»Oulunsalpietari») were compared as the nitrogen fertilizer for oats in 15 field trials and for barley in one trial. The trials were carried out in summers 1959 and 1960 in various places in Finland. The split plot technique was employed in order to reduce the variation as much as possible. In 1959 the amounts of nitrogen applied as these two fertilizers to the corresponding halves of the plots were 25 and 50 kg/ha. In 1960 also higher applications were used: 75 and 100 kg/ha of N. In three trials these fertilizers were compared both as a surface dressing and worked in. Visual observations suggested about 5—6 weeks after sowing a darker green colour in the stands treated with calcium nitrate as compared with the other half treated with ammonium nitrate limestone. These differences later disappeared. In some trials a higher nitrogen content of the plants from the calcium nitrate stands could be demonstrated during this period. The uptake of nitrogen by plants was regularly followed throughout the growing period. Owing to the large variation, usually, no statistically significant difference between the effect of the fertilizers could be detected. In a few cases the superiority of calcium nitrate could be demonstrated. No differences in the ripening could be found. In most trials there was a fairly regular tendency to higher yields and higher nitrogen content in the grain and straw produced by calcium nitrate. Yet, only in a few cases were the differences statistically significant at the five per cent level. Thus, it was concluded that on the basis of the results of these trials ammonium nitrate limestone and calcium nitrate may be considered practically equal as nitrogen fertilizers for oats. There was no difference in the yields of barley produced by these two fertilizers, but the nitrogen content of grains was significantly lower with ammonium nitrate limestone than with calcium nitrate. This may be worth further study in connection with the production of malting barley.

EFFECTS OF A ROTATION OF SIMAZINE, TERBACIL, AND DICHLOBENIL IN A MATURE APPLE ORCHARD

1981 ◽  
Vol 61 (2) ◽  
pp. 407-411 ◽  
Author(s):  
H. B. HEENEY ◽  
V. WARREN ◽  
S. U. KHAN
Keyword(s):  
Weed Control ◽  
Apple Orchard ◽  
Common Vetch ◽  
Apple Trees ◽  
Tert Butyl ◽  
Nutrient Levels ◽  
Control Growth ◽  
Vicia Cracca ◽  
Mature Apple

Annual yields of mature Kinkead Red Spy apple trees were higher when growth under trees was controlled by a rotation of three herbicides, namely, simazine (2-chloro-4, 6 bis(ethylamino)-s-triazine), terbacil (3-tert-butyl-5-chloro-6-methyluracil) and dichlobenil (2,6-dichlorobenzonitrile) compared to yields of trees in which sod was regularly mowed to control growth of weeds. While weed control with herbicide rotations was not as effective as with continuous usage of a single herbicide, it was commercially acceptable, and the problem of common vetch (Vicia cracca L.) as on escape weed, particularly with continuous simazine was largely avoided. Over the 6-yr period there was little effect on nutrient levels of the foliage. Use of a rotation of herbicides prevented the accumulation of residues in the soil and levels of all herbicides noted in year 1 of the rotation were reduced to negligible amounts 2 yr after a particular herbicide had been applied.

Joint venture survival in China: the importance of tangible and intangible trust

2018 ◽  
Vol 12 (2) ◽  
pp. 173-192 ◽  
Author(s):  
Bradley James Koch ◽  
Pamela L.T. Koch
Keyword(s):  
Trust Management ◽  
Joint Venture ◽  
Positive Impact ◽  
Performance Measure ◽  
Management Control ◽  
Primary Data ◽  
Content Type ◽  
The Future ◽  
The Relationship ◽  
A Current

Purpose The purpose of this paper is to examine the relationship among joint venture survival in Sichuan and two types of trust: intangible trust and tangible trust. Intangible trust encapsulates the internal affective aspects of trust, whereas tangible trust captures the external and more easily visible willingness to commit resources to the partnership. Design/methodology/approach The primary data used in this research are based on surveys conducted in 2002-2003 of 274 foreign invested firms in Sichuan province and are from a follow-up investigation of firm survival in 2009. Findings The results show that both intangible trust and tangible trust are significant in predicting survival in joint ventures seven years into the future. In addition, the authors explore determinates of intangible and tangible trust. Management control had no impact on intangible trust, but it had a significant positive impact on tangible trust via the presence of a foreign general manager. Cultural distance had the expected negative effect on intangible trust, but an unanticipated positive influence on tangible trust. Originality/value The main contribution of this research is establishing a link between measures of trust taken in 2002 with a performance measure from 2009. Trust today, whether it is tangible or intangible, predicts performance in the future. The majority of prior research linked a current measure of trust with a current measure of performance, which blurs the trust and performance relationship, as it is likely that the relationship is reciprocal and higher levels of trust may be the result of good performance just as much as good performance is a result of higher levels of trust.

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