scholarly journals Effect of Drip Irrigation and Nitrogen, Phosphorus and Potassium Application Rates on Tomato Biomass Accumulation, Nutrient Content, Yield, and Soil Nutrient Status

2018 ◽  
Vol 05 (01) ◽  
Author(s):  
Brewer MT ◽  
Morgan KT ◽  
Zotarelli L ◽  
Stanley CD ◽  
Kadyampaken D
Keyword(s):  
Drip Irrigation ◽  
Soil Nutrient ◽  
Biomass Accumulation ◽  
Nutrient Status ◽  
Nutrient Content ◽  
Soil Nutrient Status ◽  
Application Rates ◽  
Potassium Application ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

scholarly journals Effects of Biochar to Excessive Compost-Fertilized Soils on the Nutrient Status

Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 683 ◽  
Author(s):  
Chen-Chi Tsai ◽  
Yu-Fang Chang
Keyword(s):  
C:N Ratio ◽  
Soil Nutrient ◽  
Nutrient Status ◽  
Potential Effect ◽  
Total Carbon ◽  
Soil Nutrient Status ◽  
Positive Effects ◽  
Application Rates ◽  
Excessive Nutrients ◽  
Cu And Zn

Positive effects of a biochar–compost mix on soil nutrient status in infertile soil have been reported, but the potential effect of biochar amendments in excessive compost-fertilized soils has not been extensively studied. Excessive application of compost can result in the accumulation of nutrients and heavy metals (Cu and Zn). Thus, the objective of this study is to investigate the effect of biochar–excessive compost co-application on soil nutrient status. We hypothesized that biochar co-application could have positive effects on the absorption of excessive nutrients of Cu and Zn. A 371-day laboratory incubation study was conducted to evaluate the effects of the lead tree (Leucaena leucocephala (Lam.) de. Wit) biochar produced at 750 °C on the dynamics of the soil nutrients. Three Taiwan rural soils were selected, including slightly acidic Oxisols (SAO), mildly alkaline Inceptisols (MAI), and slightly acid Inceptisols (SAI). The biochar treatments include control (0%) and 0.5%, 1.0%, and 2.0% (w/w). In each treatment, 5% (w/w) poultry-livestock manure compost was added to test excessive application. The results indicated that the biochar treatments had a significant increase effect on soil pH, total carbon (TC), total nitrogen (TN), C:N ratio, and available K concentration. The effect of biochar on electrical conductivity (EC) and available P, Ca, Mg, Fe, Mn, Cu, Pb, and Zn was insignificant. The effect of biochar, with relatively low application rates (<2% by wt), low surface area, and less surface function group, was eliminated by excessive compost (5% by wt). In addition to carbon sequestration and nitrogen conservation, biochar addition has no effect on the absorption of the excessive nutrients Cu and Zn in three studied soils.

Application of Different Fractions of Anaerobic Digestate Significantly Influences the Carbon Cycle in Grassland Soils

2020 ◽  
Author(s):  
Marta Cattin ◽  
Kirk T. Semple ◽  
Marc Stutter ◽  
Gaetano Romano ◽  
Alfonso Lag-Brotons ◽  
...  
Keyword(s):  
Phospholipid Fatty Acid ◽  
Soil Nutrient ◽  
Nutrient Status ◽  
Nutrient Content ◽  
Microbial Biomass C ◽  
Grassland Soils ◽  
Soil C ◽  
Application Rates ◽  
C Stocks ◽  
High Nutrient

&lt;p&gt;Applying digestate to soil is of growing interest in agriculture. However, the impacts of digestate on soil biogeochemical cycles often remain unclear, especially after solid-liquid separation of whole digestate (WD). We used a 21 d incubation to examine the effects of WD and solid digestate (SD) on CO&lt;sub&gt;2&lt;/sub&gt;-C efflux, dissolved organic carbon (DOC), microbial biomass C (C&lt;sub&gt;micro&lt;/sub&gt;), phospholipid fatty acid (PLFA) and carbon use efficiency (CUE) within two grassland soils of contrasting nutrient status. Application rates for SD and WD were based on recommended N inputs to grassland soils for these organic materials. Compared to un-amended controls, cumulative CO&lt;sub&gt;2&lt;/sub&gt;-C efflux, C&lt;sub&gt;micro&lt;/sub&gt; and the fungal:bacterial in soils increased significantly following SD application, regardless of the soil nutrient content (+20% CO&lt;sub&gt;2&lt;/sub&gt;-C, +29% C&lt;sub&gt;micro&lt;/sub&gt;, +58% fungal:bacteria for high nutrient soil; +563% CO&lt;sub&gt;2&lt;/sub&gt;-C, +36% C&lt;sub&gt;micro&lt;/sub&gt;, +18% fungal:bacteria for low nutrient soil). In contrast, WD produced a significant effect on CO&lt;sub&gt;2&lt;/sub&gt;-C efflux and fungal:bacterial only in the low nutrient soil. Our results also indicated that both digestate fractions and the initial soil nutrient status affected CUE. Applying both SD and WD to a low nutrient soil potential leads to decreases in soil C stocks, whilst the application of SD to a high nutrient soil can potentially enhance soil C stocks. Digestate application must be carefully planned, accounting for both the nature of the digestate and of the soil, in order to avoid adverse impacts on soil C stocks.&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

scholarly journals Women's agricultural practices and their effects on soil nutrient content in the Nyalenda urban gardens of Kisumu, Kenya

SOIL ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 303-313 ◽  
Author(s):  
Nicolette Tamara Regina Johanna Maria Jonkman ◽  
Esmee Daniëlle Kooijman ◽  
Karsten Kalbitz ◽  
Nicky Rosa Maria Pouw ◽  
Boris Jansen
Keyword(s):  
Soil Nutrient ◽  
Nutrient Status ◽  
Nutrient Content ◽  
Agricultural Management ◽  
Soil N ◽  
Urban Gardens ◽  
Soil Nutrient Status ◽  
Agricultural Knowledge ◽  
Female Farmers ◽  
Soil Nutrient Content

Abstract. In Kisumu up to 60 % of the inhabitants practice some form of urban agriculture, with just under 50 % of the workers being female. On average, women spend more hours a day in the gardens than men. Therefore women's knowledge is pivotal for effective agricultural management. To enhance and better use women's knowledge, gender-related sociocultural obstacles linked to land ownership, investment, and farm inputs have to be taken into account. We aimed to determine how the agricultural knowledge and motivations of female farmers working in the Nyalenda urban gardens in Kisumu (Kenya) influence the soil nutrient status as reflected by the total soil C and N; available soil N and P; and exchangeable soil Na, K, Mg, and Ca. Two prevailing practices were compared to determine how the agricultural management practice influences soil nutrient content: (1) applying manure only and (2) applying manure while intercropping with cowpeas. Interviews and focus group discussions were held to explore the agricultural knowledge and motivations of the women working in Nyalenda. Soil analysis showed that the soil in Nyalenda was rich in nutrients overall but that the intercropped fields contained significantly lower total soil nutrients than fields where only manure was applied. While theoretically intercropping with a legume such as cowpeas should increase soil N content, due to socioeconomic factors, such as poverty, intercropping was applied in a way that did not increase soil nutrient contents; rather it diversified revenue. The knowledge of the female farmers was found to be limited to practical and sensory knowledge. This shows that when aiming to improve soil nutrient status and agricultural yields through agricultural training, socioeconomic conditions, cultural context, and gendered knowledge differentiation have to be acknowledged.

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