Sweet Potato Response to Boron Application on an Alfisols in the Subhumid Tropical Climate of India
ABSTRACT Splitting of sweet potato tubers because of boron (B) deficiency is a major cause of reduction in marketable tuber yield in India. Soil and plant tests are employed in this study to determine the fertilizer B requirement (FBR). Fertilizer B requirement of sweet potatos grown on an Alfisols under rainfed conditions was evaluated by two simple methods. In the first method, the relationship between B uptake and sweet potato tuber yield was utilized to find the B uptake at a given sweet potato tuber yield. This relationship was then used to find the amount of B applied for that particular uptake to set the targeted yield. In the second method, FBR was determined using the equation: FBR=(UB−U0)/BRF, where UB is B uptake at a given yield, U0 is B uptake from unfertilized soil, and BRF is the recovery of applied B. All of these parameters were determined in a field experiment with sweet potatos grown on Alfisols under rainfed conditions. The results of the study indicated a very good relation between observed value of FBR and predicted values determined by both the methodologies. Results of the study suggest that the simple models developed based on B uptake can be utilized for determining the B requirements of sweet potato.
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ABSTRACT: In many parts of the world, boron (B) levels are insufficient for potential production. Boron deficiency is also widespread in the Anatolia region of Turkey. Boron deficiency could impact production and quality of tomatoes (Lycopersicon esculentum L.), pepper (Capsicum annum L.), and cucumber (Cucumis sativus L.). A two-year greenhouse experiment was conducted to study yield and quality response of three vegetables to B addition (0, 1, 2, 3, and 4 kg B ha). The optimum economic B rates (OEBR) were 2.3, 2.6, 2.4 kg B ha, resulting in soil B concentrations of 0.33, 0.34 and 0.42 mg kg. Independent of plant species, B application decreased tissue nitrogen (N), calcium (Ca), and magnesium (Mg) but increased tissue phosphorus (P), potassium (K), iron (Fe), manganese (Mn), zinc (Zn), and copper (Cu) concentrations. We conclude that a B addition of 2.5 kg ha is sufficient to elevate soil B levels to nondeficient levels. Similar studies with different soils and initial soil-test B levels are needed to conclude if these critical soil test values and OEBR can be applied across the region.Communications in Soil Science and Plant Analysis - COMMUN SOIL SCI PLANT ANAL. 01/2010; 41(13):1576-1593.