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52 सप्ताह हेतु कृषि कार्यों की रुपरेखा
भूमि उपयोग के तरीके
एन.बी.एम.एम.पी.
अन्य उपयोगी लिंक
कृषि मोबाइल पोर्टल
Target Yield Concept

Target Yield Concept

(i) Wheat

The fact that the fertilizer are becoming a constraint in agricultural production due to energy crisis particularly in developing countries such as ours,
it is of great benefit to work out the most economical dose of this input based upon target yield approach in which the efficiency of a nutrient from
soil and fertilizer sources is taken into consideration to complete fertilizer doses for attaining desired yield level of a particular crop in a given soil system.
Such an information has been generated for wheat crop being grown on the acid soils of Himachal Pradesh. The information is as follows:

Nutrient N P2O5 K20
Nutrient requirement (kg) to produce 1 q of wheat grain 2.35 0.63 1.66
Per cent contribution from available nutrient from soil 6.0 41.6 12.8
Per cent contribution from applied fertilizer 47.8 8.0 68.3

 

(b) Computation of fertilizer dose based upon the basic information :

Fertilizer dose (kg/ha) = (Constant1) X (T) -(Constant2) X (STV (kg/ha))



Where T = Yield target (q/ha)
           STV = Soil test value (kg/ha) 
          Constant1 = {(Nutrient required (kg)to produce 1 q grain) / (% contribution from fertilizer)}
          Constant2 = {(% contribution for soil) / (% contribution for fertilizer (kg/ha))}



Soil Analysis



pH OC Texture Available nutrient (kg/ha)
N P K
5.7 0.63 CL (Clayloam) 600 30 95




(c) Transformation of the data (b) into fertilizer equations to achieve specified yield target for wheat :

FN = 491 T-0.124 SN
FP2O5 = 7.86 T-5.16 (SP)
FK2O = 2.44 T-0.187 (SK)



(ii) Lentil (HPL-5)

FN = 10.53 T-0.40 SN
FP2O5 = 8.77 T-8.62 SP
FK2O5 = 3.26 T-0.13 SK

(iii) Gram (C-235) 

FN = 13.35 T-0.46 SN
FP2O5 = 4.56 T-7.02 SP
FK2O5 = 2.12 T-0.09 SK

FN, FP2O5 & K2O stand for fertilizer N,P2O5 and K2O
T - Target yield (q/ha)
NS, SP, SK stand for available N, P and K in the soil.

s
Treatment Yield
target
(kg/ha)
Fert. dose Yield
obtained
kg/ha
Per cent
Deviation
Yield
response
Response
yardstick
kg/ha
NPK
Price of
add.
Yield
Rs/ha
Cost of
fertilizer
Rs/ha
Cost of
Net
profit
Rs/ha
Benefit
cost
ratio
T1* -- O0P0 1343 -- -- -- -- -- -- --
T2* -- N90P90K45 3132 -- 1789 14.3 1376.15 779.40 596.75 0.76
T3 2000 N16P2K31 2032 +1.6 689 14.1 895.70 119.30 776.40 6.50
T4 2500 N41P42K43 2597 +3.9 1254 10.0 1630.20 392.65 1237.55 3.17
T5 3000 N65P81K55 3110 +3.7 1767 8.8 2297.10 658.09 1639.01 2.49
T6 3500 N90P120K67 3546 +1.3 2203 7.9 2863.90 927.68 1936.22 2.09
T7 4000 N114P160K80 4125 +3.1 2782 7.8 8616.60 1198.30 2418.22 2.02
T8 5000 N64P238K104 4275 -14.5 2932 5.8 381.60 1737.40 2074.20 1.19

                                                                                                         Soil properties

T1* = control                                                      Texture       O.C%         AvN       AvP      AvK
T2* = yield obtained as per state level dose        Clayloam    0.43-0.78   436-698  16-38   80-121


Conclusion: Based upon the benefit ratio, one can conclude that farmers of the region can obtain wheat yields upto 30-40 q/ha if they apply fertilizers in acid soils of H.P. in accordance with the target yield concept. 
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