scholarly journals Nitrogen and phosphorus effluent loads from a paddy-field district adopting collective crop rotation

2012 ◽  
Vol 66 (5) ◽  
pp. 1074-1080 ◽  
Author(s):  
T. Hama ◽  
T. Aoki ◽  
K. Osuga ◽  
S. Sugiyama ◽  
D. Iwasaki
Keyword(s):  
Crop Rotation ◽  
Paddy Field ◽  
Surface Runoff ◽  
Paddy Rice ◽  
Rice Crop ◽  
Nutrient Load ◽  
Nitrogen And Phosphorus ◽  
Investigation Period ◽  
Rotation Crops

Japanese paddy rice systems commonly adopt the rotation of vegetables, wheat and soybeans with paddy rice. Crop rotation may, however, increase the nutrient load in effluent discharged from the district because more fertilizer is applied to the rotation crops than is applied to paddy crops. We investigated a paddy-field district subject to collective crop rotation and quantified the annual nutrient load of effluent from the district in three consecutive years. The total annual exports of nitrogen and phosphorus over the investigation period ranged from 30.3 to 40.6 kg N ha–1 and 2.62 to 3.13 kg P ha–1. The results suggest that rotation cropping increases the effluent nutrient load because applied fertilizer is converted to nitrate, and surface runoff is increased due to the absence of shuttering boards at the field outlets.

scholarly journals Drainage and leaching losses of nitrogen and dissolved organic carbon after introducing maize into a continuous paddy-rice crop rotation

2017 ◽  
Vol 249 ◽  
pp. 91-100 ◽  
Author(s):  
Yao He ◽  
Eva Lehndorff ◽  
Wulf Amelung ◽  
Reiner Wassmann ◽  
Ma. Carmelita Alberto ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Crop Rotation ◽  
Paddy Rice ◽  
Rice Crop ◽  
Leaching Losses

FERTILIZATION SYSTEM AS A WAY OF SOIL FERTILITY AND STABILIZATION OF FIELD CROP ROTATION PRODUCTIVENESS

1970 ◽  
pp. 38-41
Author(s):  
V. T. Sinegovskaya ◽  
E. T. Naumchenko
Keyword(s):  
Soil Fertility ◽  
Crop Rotation ◽  
C:N Ratio ◽  
Mineral Fertilizer ◽  
Organic Fertilizers ◽  
Nitrogen And Phosphorus ◽  
Rotation System ◽  
Mobile Phosphorus ◽  
Crop Rotation System ◽  
Fertilizer System

The article presents the results of comparative evaluation of the efficiency of the long-term application of mineral and organic fertilizers in the crop rotation system. It was found that the application of the mineral fertilizer system increased the value of hydrolytic acidity of the soil from 4,30 to 5,29 mg-eq per 100 g of soil, the indicator of metabolic acidity decreased from 5,2 to 4,9 pH units. By the end of the 11th rotation for both fertilizer systems, the content of mobile phosphorus increased by more than 4 times relative to the initial value, its mobility indicator – by 2,2-3,2 times compared with the control. The use of the organo-mineral system was accompanied by an increase in the content of humus by 0,35 % and a decrease in the C:N ratio from 11,2 to 8,9. The increased productivity of wheat was revealed when applying nitrogen and nitrogen-phosphorus fertilizers against the background of prolonged use of the mineral and organo-mineral fertilizer system. The change in wheat productivity by 56 % depended on the content of mineral nitrogen, mobile phosphorus, humus in the topsoil, and on the phosphate ion mobility. Soybean productivity depended on soil fertility indicators only by 24 %: the relationship between soybean productivity and the mineral forms of nitrogen and phosphorus is weak and direct, between productivity and P2O5 mobility - weak and inverse, with humus - moderate and direct.

Toxicity of biocides to native cyanobacteria at different rice crop stages in wetland paddy field

2017 ◽  
Vol 30 (1) ◽  
pp. 483-493 ◽  
Author(s):  
Nalinaxya Prasad Dash ◽  
Manish Singh Kaushik ◽  
Ajay Kumar ◽  
Gerard Abraham ◽  
Pawan Kumar Singh
Keyword(s):  
Paddy Field ◽  
Rice Crop

ESTIMATING OF CROP YIELD DEPENDENCE IN CROP ROTATION FROM THE USE OF SAPROPELS, LIME, NITROGEN AND PHOSPHORUS FERTILIZER

2021 ◽  
pp. 13-20
Author(s):  
Igor Vasilievich Sinyavskiy ◽  
Aleksey Mikhailovich Plotnikov ◽  
Andrey Viktorovich Sozinov ◽  
Natalya Dmitrievna Gushchenskaya
Keyword(s):  
Crop Rotation ◽  
Crop Yield ◽  
Phosphorus Fertilizer ◽  
Nitrogen And Phosphorus

Mitigating a global expansion of toxic cyanobacterial blooms: confounding effects and challenges posed by climate change

2020 ◽  
Vol 71 (5) ◽  
pp. 579 ◽  
Author(s):  
Hans W. Paerl ◽  
Karl. E. Havens ◽  
Nathan. S Hall ◽  
Timothy G. Otten ◽  
Mengyuan Zhu ◽  
...  
Keyword(s):  
Climate Change ◽  
Algal Blooms ◽  
Synergistic Effects ◽  
Cyanobacterial Blooms ◽  
Extreme Weather Events ◽  
Nutrient Load ◽  
Nitrogen And Phosphorus ◽  
Sediment Dredging ◽  
Fish Removal ◽  
Global Expansion

Managing and mitigating the global expansion of toxic cyanobacterial harmful algal blooms (CyanoHABs) is a major challenge facing researchers and water resource managers. Various approaches, including nutrient load reduction, artificial mixing and flushing, omnivorous fish removal, algaecide applications and sediment dredging, have been used to reduce bloom occurrences. However, managers now face the additional challenge of having to address the effects of climate change on watershed hydrological and nutrient load dynamics, water temperature, mixing regime and internal nutrient cycling. Rising temperatures and increasing frequencies and magnitudes of extreme weather events, including tropical cyclones, extratropical storms, floods and droughts, all promote CyanoHABs and affect the efficacy of ecosystem remediation measures. These climatic changes will likely require setting stricter nutrient (including both nitrogen and phosphorus) reduction targets for bloom control in affected waters. In addition, the efficacy of currently used methods to reduce CyanoHABs will need to be re-evaluated in light of the synergistic effects of climate change with nutrient enrichment.

scholarly journals Justification of elements of rice cultivation technology

2020 ◽  
Vol 175 ◽  
pp. 01006 ◽  
Author(s):  
Nadezhda Malysheva ◽  
Anna Khadzhidi ◽  
Evgeny Kuznetsov ◽  
Noureldin Sharaby ◽  
Alexander Koltsov
Keyword(s):  
Soil Fertility ◽  
Crop Rotation ◽  
Rice Variety ◽  
Sprinkler Irrigation ◽  
Rice Fields ◽  
Water Soluble ◽  
Rice Crop ◽  
Soil Conditions ◽  
Rice Productivity ◽  
The Impact

The purpose of the research is to identify the impact of sprinkler irrigation in rice crop rotation on rice productivity and soil fertility of irrigated lands of the Krasnodar region. To achieve this goal, the tasks of studying the density of weed seedlings after sprinkler irrigation, the content of water-soluble salts and humus in the soil of rice fields, and the reaction of an intensive variety of rice cultivated after irrigation and drainage techniques in rice fields were completed. Material and methods. Field studies were carried out on the Kuban irrigation system of the Krasnodar territory, which is the most typical in terms of soil conditions for the western climatic zone of the region, with various variants for sprinkler irrigation after major planning of basins. An intensive of Rapan rice variety was used. The methods of the Federal Research Center for Rice, the Kuban State Agrarian University, and Russian standards were applied. Conclusions, the obtained results of the conducted studies prove the effectiveness of sprinkler irrigation in rice crop rotation, increase soil fertility, rice productivity, and contribute to the production of environmentally friendly products without herbicides treatment.

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