Boron Deficiency In Young Coconut (&lt;i&gt;Cocos nucifera&lt;/i&gt; L.) In Sri Lanka Symptoms and Corrective Measures

Jayasekara, K.S.; Loganathan, P.

doi:10.4038/cocos.v6i0.2053

Cited by 5 publications

(2 citation statements)

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“…Boron concentrations were lower than the optimum concentrations (Table 2) in all soils. Boron deficiency has long been recognized in tea and coconut soils of Sri Lanka (Jayasekara and Loganathan 1988;Shorrock 1997). Concentrations of Cu and Zn were less than the optimum concentrations in many of the tested soils.…”

Section: Available Nutrient Concentrations In Soilsmentioning

confidence: 96%

Systematic Approach to Diagnosing Fertility Problems in Soils of Sri Lanka

Kumaragamage

Indraratne

2011

Communications in Soil Science and Plant Analysis

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Diagnosing soil fertility problems is essential to supply plant nutrients in a complete and a balanced manner. We evaluated and validated a systematic approach of diagnosing fertility problems based on optimum values established elsewhere for 32 cultivated soils representing different agroecological zones of Sri Lanka. Soils were analyzed for available ammonium nitrogen , phosphorus (P), potassium (K), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), calcium (Ca), magnesium (Mg), sulfate -sulfur (SO 4 −S), and boron (B) concentrations, and based upon these analyses we calculated nutrient application rates. Molybdenum (Mo) and calcium carbonate (CaCO 3 ) application rates were calculated based on the active acidity of soils, while those of P, K, S, Cu, Mn, Zn, and B were adjusted considering their respective fixation capacities. An optimum treatment providing nutrients at "optimum" concentrations was validated in the greenhouse using sorghum as the indicator plant. The optimum treatment was compared with 13 other treatments of individual nutrients or CaCO 3 consisting of either omissions (optimum treatment minus a particular nutrient) or additions (optimum treatment plus a particular nutrient) . The treatments were replicated four times. All soils were deficient in N and B, while most (30 out of 32) were deficient in P, K, and S. Deficiencies of Ca, Mg, Cu, Zn, and Mn were less common (<75% of soils), while all soils had sufficient Fe. Fixation abilities for nutrients varied widely. Significant (P < 0.05) yield reductions in minus treatments were observed for N and P in 100% of soils; K, S, and CaCO 3 in 50-60% of soils; Ca in 38% of soils; and Mg, Cu, Zn, B, and Mo in less than 20% of soils. Plus treatments gave significant yield reductions occasionally, probably due to toxicities and nutrient imbalances. In 11 soils identified as deficient in K, Ca, and B, dry-matter yields were significantly lower in the optimum treatment than the respective minus treatment, indicating that bringing the nutrient concentration up to the optimum level reduced the yields, signifying the need to validate the optimum levels used for these nutrients. This approach of combining soil analyses and fixation studies could be successfully used to diagnose fertility problems; however, the results indicate the need to adjust the "optimum" concentrations of K, Ca, and B before using them in a fertilizer recommendation program.

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Section: Available Nutrient Concentrations In Soilsmentioning

confidence: 96%

Systematic Approach to Diagnosing Fertility Problems in Soils of Sri Lanka

Kumaragamage

Indraratne

2011

Communications in Soil Science and Plant Analysis

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“…The plant nutrient limitation may occur through the low nutrient content in soil or the antagonisitc effect of the high content of other nutrients. Therefore, to ensure the sufficient supply of all the nutrients depends on the balanced third leaf is 8-10 ppm and the deficiency could be corrected by soil application of sodium tetraborate (Jayasekara and Loganathan 1988).…”

Section: Nutrient Requirementmentioning

confidence: 99%

Diagnosis and management of soil fertility constraints in coconut (Cocos nucifera) : A review

Malhotra¹,

Maheswarappa

Selvamani

et al. 2017

Indian J Agri Sci

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Coconut (Cocos nucifera L.) is an important perennial plantation crop and to improve the productivity, the innate soil constraints should be ameliorated. The red, lateritic and sandy coconut soils are suffering with soil acidity, low CEC and poor nutrient reserve. A study on nutrient removal by coconut provides guidelines for the fertilizer input required. The effect of soil nutrient imbalance on the availability of nutrients emphasize the need based balanced fertilizer supply to coconut soils. The built up of soil available P in acidic red soils under continuous phosphatic fertilizer application strengthens the need to realize the soil test based fertilizer application. The potassium supply in the acid soils is poor, coconut being a huge feeder of potassium needs constant supply of potassium. Secondary and micronutrient deficiencies are emerging as potential yield limiting nutrients for coconut. Biomass recycling studies under coconut based cropping systems shows promising results in achieving the nutrient supply with the available biomass recycling through vermicompost. Minimizing the biomass exported out of farm especially coconut husk may improve potassium supply to palms through organic farming. Microbial studies showed that biomass recycling improved the beneficial microorganism in the rhizosphere and thereby enhances the nutrient availability. Fertigation technique showed higher nutrient use efficiency, soil and water conservation measures improved the yield of coconut in sandy soil and checks the losses through run-off and erosion in sloppy soils. Site specific soil management strategies can improve the coconut yield in an eco-friendly way.

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