Orange crop Cultivation 3


Orange crop Cultivation 3
Orange crop Cultivation 3

 

 

Nutrient Management [ Orange crop ]



 Cap  3

It is prudent to follow leaf nutrient standards to maintain the required level of nutrients in leaves so as to maintain high productivity. Generally, 2.5 to 3% N, 0.15 to 0.20% P, and 1.5 to 2.5% K is the range for leaf NPK to get good to a very good crop.


Major nutrient doses depending on plant age are given in table 1. Mandarin orange requires sufficient Calcium, Zn, Mn, Iron, and Boron also. For optimum to the high productivity of trees 3-3.5 % Calcium and 0.4 to 0.6% Magnesium and 0.3 to 0.5% Sulphur needs to be maintained in leaves.


Micronutrients like Zinc, Manganese, Copper, Iron, and boron should be 50-200 ppm, 50-270ppm, 10-55 ppm, 125-200 ppm, and 100-200 ppm in the leaves. The leaf nutrient levels vary in different mandarin cultivars in the given range as above for good to very good yields.




 

Orange crop


Farmyard manure (FYM) is applied by mixing in the soil in the plant basin before the monsoon. Ten kg of well-decomposed FYM is applied to a one-year-old plant per year while it is 20, 30, 40, and 50 kg for the 2,3,4, and 5-year-old plants.


Traditionally, in soil application, nitrogen is given in three split doses (1/3 dose before flowering, 1/3 dose two months after fruit set, and 1/3 four months after fruit set). Phosphorus and potash are given before flowering by mixing superphosphate and muriate of potash in soil.


In soil with high calcium carbonate content, ammonium sulfate should be used in place of urea.


Micronutrients are best applied through foliar application when leaves are fully expanded after a new flush. Orange crop Mandarin orange put forth new flush in February- March, June-July, and October, and therefore sprays are generally given in April-May and July-August.


For soil application chelated forms of zinc sulfate, manganese sulfate, and ferrous sulfate are preferred @100g/plant before flowering. For foliar application, 2.5g ZnSO₄ per liter of water (0.25%), and 2.0 g FeSO₄ per liter of water (0.2%) should be taken.


The addition of urea @10g per liter of water (1%) in the above solutions increases micronutrient absorption. Similarly, MnSO₄ and Borax can be used @2.5 g/litre and 1.0g per liter of water, respectively, if need to be sprayed.



For Nagpur mandarin, keeping in view high yields, 800 g N, 300 g P²O⁵ and 600 g K₂O along with 50 kg FYM plus 7.5 kg Neem cake has been recommended for the full-grown tree.


Apart from this, 500 g vascular arbuscular mycorrhiza (VAM) + 100 g phosphorus solubilizing bacteria + 100 g Azospirillium + 100 g Trichoderma harzianum has given good results. the traditional application method is to apply all doses of organic manure at the time of breaking moisture stress.

Recent studies have shown that vermicompost improves fruiting and fruit quality and some part of farmyard manure (like 25-50%) can be replaced with vermicompost depending on the availability of vermicompost. Microbial agents like plant growth-promoting rhizobacteria have also improved nutrient availability and this recommended dose of chemical fertilizer can be reduced by 25%. Microbial cultures of Azospirillium and Trichoderma can be used @100g each mixed with vermicompost in the soil just before the monsoon.



 

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