Abstract
Abstract This present investigation took place on a continuing long‐term fertilizer experiment, initiated in 1972 at the experimental farm of the College of Agriculture CSK HPKV, Palampur, aimed at studying nutrient dynamics of micronutrients, especially Zn, after continuous use of chemical fertilizers and amendments over the previous 36 years in an acid Alfisol under a maize–wheat system. Treatments investigated were as follows: T 1 : Control; 100% N; 100% NP; 100% NPK (optimal application ‐ 120:26:33(maize)/25(wheat)); 100% NPK + FYM (10 t ha −1 to the maize crop); T 6 : 100% NPK + lime (900 kg ha −1 ); T 7 : 100% NPK + Zn (25 kg ha −1 as ZnSO 4 ); T 8 : 100% NPK + Hand weeding; T 9 : 100% NPK (‐S); T 10 : 150% NPK (super‐optimal application); and T 11 : 50% NPK (sub‐optimal application). Different forms of zinc in soil were determined through a sequential extraction method. Results revealed that previous applications of high‐analysis fertilizers and amendments caused a marked depletion in the pools of Zn as compared to buffer plots. All pools of Zn as well as crop productivity and Zn uptake were noticeably greater in farmyard manure (FYM)‐amended plots compared with plots not receiving fertilizer. The residual fraction was the dominant form but organically bound and exchangeable forms were found to play major role in nutrient supply, crop productivity and nutrient uptake. Correlation and regression analysis studies showed that organic forms constituted the most important pool contributing towards variation in yield and uptake by maize and wheat crops. Exchangeable and organically bound forms contributed significantly towards the availability of DTPA‐extractable Zn in soil.
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Claims 6
Claim · model-written summary
Previous high-analysis fertilizer and amendment applications markedly depleted soil Zn pools compared with buffer plots.
- Taxon
- maize and wheat
Triticum aestivum
Zea mayse2 - Treatment
- previous applications of high‐analysis fertilizers and amendmentse1
- Outcome
- pools of Zne1
- Direction
- depletione1
- Comparator
- buffer plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Results revealed that previous applications of high‐analysis fertilizers and amendments caused a marked depletion in the pools of Zn as compared to buffer plots”
e2“variation in yield and uptake by maize and wheat crops”
Claim · model-written summary
FYM-amended plots had greater Zn pools, crop productivity and Zn uptake than plots not receiving fertilizer.
- Taxon
- maize and wheatTriticum aestivumZea mayse2
- Treatment
- farmyard manure (FYM)‐amended plotse1
- Outcome
- All pools of Zn as well as crop productivity and Zn uptakee1
- Direction
- greatere1
- Comparator
- plots not receiving fertilizere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“All pools of Zn as well as crop productivity and Zn uptake were noticeably greater in farmyard manure (FYM)‐amended plots compared with plots not receiving fertilizer”
e2“variation in yield and uptake by maize and wheat crops”
Claim · model-written summary
The residual fraction was the dominant form of soil Zn.
- Taxon
- maize and wheatTriticum aestivumZea mayse2
- Outcome
- residual fractione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The residual fraction was the dominant form”
e2“variation in yield and uptake by maize and wheat crops”
Claim · model-written summary
Organically bound and exchangeable Zn forms are reported to play a major role in nutrient supply, crop productivity and nutrient uptake.
- Taxon
- maize and wheatTriticum aestivumZea mayse2
- Outcome
- nutrient supply, crop productivity and nutrient uptakee1
- Qualifier
- organically bound and exchangeable forms were found to play major rolee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“organically bound and exchangeable forms were found to play major role in nutrient supply, crop productivity and nutrient uptake”
e2“variation in yield and uptake by maize and wheat crops”
Claim · model-written summary
Organic Zn forms were the most important pool contributing to variation in yield and uptake by maize and wheat.
- Taxon
- maize and wheatTriticum aestivumZea mayse1
- Compound
- organic formse1
- Outcome
- variation in yield and uptakee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“organic forms constituted the most important pool contributing towards variation in yield and uptake by maize and wheat crops”
Claim · model-written summary
Exchangeable and organically bound Zn forms contributed significantly to the availability of DTPA-extractable Zn in soil.
- Taxon
- maize and wheatTriticum aestivumZea mayse2
- Compound
- Exchangeable and organically bound formse1
- Outcome
- availability of DTPA‐extractable Zne1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Exchangeable and organically bound forms contributed significantly towards the availability of DTPA‐extractable Zn in soil”
e2“variation in yield and uptake by maize and wheat crops”
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