PHOSPHORUS AND ZINC INTERACTION IN CLAY LOAM SOILS UNDER SORGHUM
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Date
2022-08-12
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Abstract
A field experiment entitled “Phosphorus and Zinc Interaction in Clay
Loam Soils Under Sorghum” was conducted at Agricultural College Farm,
Bapatla, during Rabi, 2020. The experimental soil was clay loam in texture,
neutral in reaction, non-saline, low in organic carbon, low in available N,
medium in available phosphorus, and high in potassium and sufficient in all
available micro nutrient’s (Zn, Fe, Mn and Cu).
The experiment was laid out in randomized block design (RBD) with nine
treatments replicated thrice. The treatments comprised of T1 - Control (Zero P&
Zn), T2 -100% Recommended Dose of Phosphorus (RDP), T3 -100%
Recommended Dose of Zinc (RD Zn), T4 -75% RDP + 100% RD Zn, T5 -100%
RDP + 100% RD Zn, T6- 125% RDP + 100% RD Zn, T7 - 75% RDP + 75% RD
Zn, T8 - 100% RDP + 75% RD Zn, T9 -125% RDP + 75% RD Zn.
Well decomposed farmyard manure @ 10 t ha-1 was applied before
sowing. A common dose of nitrogen @ 100 kg ha-1 was applied in the form of
urea in two equal splits i.e., 1/2 as basal and 1/2 at 60 DAS. Recommended dose
of P2O5 @ 30 kg ,40 kg and 50 kg ha-1 were applied as per the treatments as basal
just before sowing. A common dose of 60 kg K2O ha-1was applied as muriate of
potash i.e., as basal dose. Recommended dose of Zn as ZnSO4 @ 37.5 kg and 50
kg ha-1 was applied as per the treatments as basal before sowing.
To study the influence of various treatments on growth parameters, yield
attributes, yield, soil physico-chemical properties, available nutrients, Pfractions
and Zn-fractions, nutrient content and uptake at different stages were
determined by standard procedures.
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The soil properties viz., pH, EC and organic carbon, available potassium
were not significantly influenced by the imposed treatments, there was
significant influence of the treatments on available nitrogen and phosphorus.
Among the micronutrients the treatmental influence was significant on Zn and
Fe, while Mn and Cu were not significantly influenced. The available
phosphorus and zinc content was markedly influenced by different levels of
phosphorus and zinc fertilizers along with recommended dose of fertilizers at
different growth stages of the crop.
The P fractions (Al-P, Fe-P, Ca-P and total –P) were significantly
influenced by application of 100% RDP. Whereas available P and Saloid-P were
significantly influenced by application of 100% RDP along with 75% RD Zn.
The Zn fractions (water soluble & exchangeable zinc, organically complexed
Zn,) were significantly influenced by application of 100% RD Zn. Whereas
Amorphous Sesquioxide–bound Zn and Crystalline sesquioxide bound Zn were
significantly influenced by application of 100% RDP.
There was a significant improvement in the dry matter production, yield
attributes, grain and stover yield of sorghum with application of 100% RDP +
75% RD Zn (T8) and it was on par with T9 (125% RDP + 75% RD Zn). Lowest
was recorded in T1 [Control (without P& Zn)].
The nutrient contents (N, K, Fe, Mn and Cu) of sorghum at flowering and
harvest (grain &stover) stage were not significantly influenced by treatments
whereas P and S, Zn contents were significantly influenced by the treatment T8
(100% RDP +75% RD Zn) which was on par with T9 (125% RDP + 75% RD
Zn) and these two treatments were significantly superior over the other
treatments. whereas Zn content was significantly higher with treatment supplied
with T3 (100% Recommended Dose of Zinc (RD Zn). Lower values of all the
nutrients were recorded in the treatment T1(control - without P & Zn).
Uptake of nutrients (N, P, K, S, Mn and Cu) at flowering and harvest
(grain &stover) was markedly influenced by the treatment T8 (100% RDP + 75%
RD Zn) which was on par with T9 (125% RDP + 75% RD Zn). whereas highest
Zn and Fe uptake by sorghum crop at flowering and harvest (grain &stover) stage
were recorded in the treatment T3 (100% RD Zn). While lower values were
recorded in the treatment T1 (control - without P & Zn).
Overall, the study indicated that application of phosphorus and zinc
fertilizers proved significantly superior in yield, plant nutrient content, uptake
and soil available nutrient status in sorghum.
Description
PHOSPHORUS AND ZINC
INTERACTION IN CLAY LOAM
SOILS UNDER SORGHUM