Changes in soil fertility parameters and the environmental effects in a rapidly developing region of China

A viticultura é uma atividade relevante para os produtores rurais do Estado de São Paulo, sobretudo aqueles detentores de pequenas áreas. O presente trabalho teve como objetivo caracterizar os principais aspectos sociais e tecnológicos utilizados na produção de uvas para mesa na região de Jales (SP). Os dados foram levantados nos anos de 2009 e 2010, a partir da aplicação de questionários a 19 produtores de uva e do acompanhamento do ciclo de produção de 10 propriedades. Os produtores cultivam pelo menos três cultivares diferentes de uva, sendo as principais: 'Niagara Rosada', 'Itália' e 'Benitaka'. A área média das propriedades é de, aproximadamente, 21 ha, e a área média com parreiras de uva é de 2,4 ha. A maioria dos produtores não conta com assistência técnica regular, não segue recomendações de adubação e não emprega critérios técnicos para o manejo da irrigação. O controle de doenças é realizado de forma preventiva e intensa, chegando a superar 100 aplicações por ciclo, no caso das uvas finas para mesa. Os resultados devem subsidiar a realização de outras pesquisas, assim como programas de planejamento e transferência de tecnologia, proporcionando ao produtor um manejo mais adequado da cultura, bem como o desenvolvimento sustentável rural regional.

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“…O uso excessivo de fertilizantes fosfatados e nitrogenados causam a eutrofização de águas (DARILEK et al, 2009). …”

Section: Adubaçãounclassified

Caracterização social e tecnológica da produção de uvas para mesa em pequenas propriedades rurais da região de Jales-SP

2012

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“…However, as several long-term field studies observed, excessive soil fertility, especially N fertilizer over-inputs in North China and East China caused nutrient imbalances, contributing to acidification, and decreasing C/N ratios (Darilek et al, 2009;Peng, 2011), but also resulting in a reduced yield response to continuously increasing chemical fertilizer use . As Tian et al (2012) suggested, the continuous rise in N fertilization rate might not stimulate C accumulation in agricultural soils further because crop productivity in response to N addition has begun to decline in large areas of China, resulting in less C entering into the soil.…”

Section: Factors Influencing Regional Grain Yields Over the Last 20 Ymentioning

confidence: 99%

“…As some reported, regional crop yield responses to fertilization can vary from year to year due to variation in weather conditions, but also because of indigenous nutrient supply, and interactions of climate variability and nutrient management (Trnka et al, 2012 (Gu, 2003), but also soil quality, genetics, and land management (Licker et al, 2010), to help in developing region-specific fertilizer management practices to reach an optimal, and sustainable level (Darilek et al, 2009) under varying regional climate conditions.…”

Section: Some Uncertainties In Analyzing Regional Yield Differences Amentioning

confidence: 99%

“…The soil nutrient surplus in China has been increasing since the 1980's, particularly in the more developed southeastern provinces (Shen et al, 2005), with the major cereal-producing provinces such as Shandong, Henan and Sichuan maintaining high fertilizer inputs over time (Liu et al, 2009). In these regions, fertilizer applications are often far greater than crop demands, leading to excess soil nutrient accumulation, especially higher nitrogen (Darilek et al, 2009). Positive nutrient balances can build up soil fertility and enhance soil productivity, but can also decrease agronomic fertilizer-use efficiency, and increase the risk of fertilizer loss and potential environment impacts (Peng, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Changes in regional grain yield responses to chemical fertilizer use in China over the last 20 years

Wang

Dan

Grant

et al. 2018

J. Soil Sci. Plant Nutr.

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A major challenge facing China is to meet the increasing food demand of its growing population in the face of decreasing arable land area, while sustaining or improving soil productivity and avoiding adverse environmental impacts from intensive agriculture. This study uses data from China Statistical Yearbooks to analyze trends in regional soil productivity and grain yields in the major grain-producing regions in North China (NC), Northeast China (NE), East China (EC), Central China (CC), and Southwest China (SW), associated with regional fertilizer use and annual climate variation in rainfall and mean temperature over the 20 years. During 1992-2012, the average fertilizer increase rates (in kg ha -1 year -1 ) were in the order of regions CC (6.6) > NC (4.8) > EC (2.4) > SW (2.1) > NE (1.3), while yield responses to fertilizer use (with regression model coefficients, in kg kg -1 ) were in the order: SW (-0.9) < CC (1.1) < NC (1.7) < EC (5.7) < NE (9.3), showing higher yield responses to fertilizer use for NE and EC than for other regions. The changes in regional grain yields also showed higher yield responses to soil-based productivity for NC, CC, and SW, or to annual climate variability for CC than for other regions, indicating that other factors (such as inherent soil productivity or annual climate variability could be more important than fertilizer in affecting yields. The strategies for regulating nutrient management are needed considerably based on regional indigenous soil nutrient supply under varying regional climate conditions.

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“…For instance, repeated-application of urea under crop production and soil fertility improvement program is not only causing nutrient imbalances, but also negatively affecting the physical and biological properties of the soils [3]. Thus under common nitrogen fertilizer applications, natural nutrient cycling, microbial biomass, enzymatic activity and water-holding capacity of the soil are dramatically reduced whereas acidification and nitrate accumulation in water bodies increases [2] [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Maize/Haricot Bean Intercropping on Soil Fertility Improvement under Different Tied Ridges and Planting Methods, Southeast Ethiopia

Beshir¹,

Abdulkerim²

2017

GEP

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Mono cropping is the dominant factor influencing plant nutrient uptake and loss of soil quality in Ethiopia whereas intercropping of cereal/legume has positive environmental qualities. Likewise drought and moisture stress condition is widely expanding from all direction to the center of the country. Therefore, the objective of this research was to evaluate influence of planting methods, tied ridge and cropping system on different soil chemical properties in case of Madda Walabu district, Southeast Ethiopia. It was undertaken at Bidire from March 2016 to January, 2017. In this experiment, one maize variety (Melkassa 2) and one haricot bean variety (Nasir) were used. Treatments include open end and closed end tied ridge; sole cropping and intercropping; and in furrow, on ridge and flat bed planting. Each treatment has been triplicate and the experiment plots were laid out in randomized complete block design. Intercropping of maize-haricot bean with tied ridge and planting methods were highly influenced soil pH, exchangeable potassium, available phosphorous, soil organic matter and total soil nitrogen. Generally, the use of intercropping and closed end tied ridge in combination with in furrow planting significantly increased (p 0.05 ) soil fertility in the system, which could be promising for sustainable improvement of crop production and productivity for semi arid areas of Bale zone.

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Changes in soil fertility parameters and the environmental effects in a rapidly developing region of China

Cited by 66 publications

References 21 publications

Caracterização social e tecnológica da produção de uvas para mesa em pequenas propriedades rurais da região de Jales-SP

Caracterização social e tecnológica da produção de uvas para mesa em pequenas propriedades rurais da região de Jales-SP

Changes in regional grain yield responses to chemical fertilizer use in China over the last 20 years

Effect of Maize/Haricot Bean Intercropping on Soil Fertility Improvement under Different Tied Ridges and Planting Methods, Southeast Ethiopia

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