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Subject: Soil Sciences × Author: Diksha × Start date: 2001 × Type: Thesis ×
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    ThesisItemOpen Access
    Dynamics of zinc and iron under long-term application of manure and fertilizers in pearl millet-wheat system
    (CCSHAU, Hisar, 2021-08) Diksha; Narender
    In order to understand the dynamics of zinc and iron under long-term application of manure and fertilizers in pearl millet-wheat system, laboratory as well as field experiments were conducted at Soil Research Farm, CCSHAU, Hisar during 2019-21. The experiment initiated at Soil Research Farm, CCSHAU, Hisar in Rabi, 1967 was taken under consideration. The treatments include two modes of FYM application (only Rabi and both in Kharif and Rabi) along with three FYM doses (5, 10 and 15 t ha-1) and three nitrogen levels (0, 60 and 120 kg ha-1) in various combinations laid out in split plot design. The results revealed that the soil pH ranged from 7.40 to 7.67 and was found neutral in reaction. The value of EC ranged from 0.50 to 0.83 dS m-1. The present status of soil organic carbon (SOC) content was medium to high under all the treatments including control (0.69 to 1.97 %). The content of Zn and Fe fractions in post-harvest soil samples was significantly increased with the increasing doses of FYM and nitrogen under both the modes of application and significantly decreased with increasing soil depths over control. The maximum grain and straw yield of wheat (6.08 t ha-1 in grain and 8.25 t ha-1 in straw) were recorded under the application of FYM @ 10 t ha-1 plus nitrogen @ 120 kg ha-1 both in Kharif and Rabi mode of application. However, the minimum grain and straw yield of wheat (2.38 t ha-1 in grain and 3.47 t ha-1 in straw) were recorded under control. The total Zn and Fe content in wheat grain and straw were significantly increased with the different modes of FYM application and nitrogen levels. The total Zn uptake in grain ranged from 59.43 to 225.99 g ha-1 and from 39.25 to 195.73 g ha-1 in straw and total Fe uptake varied from 50.09 to 270.52 g ha-1 in grain and from 545.98 to 1498.55 g ha-1 in straw, respectively. The highest total Zn and Fe uptake by wheat was recorded under treatment FYM @ 15 t ha-1 and nitrogen @ 120 kg ha-1 both in Kharif and Rabi mode of application. The Pearson correlation analysis showed that the fractions of Zn and Fe are not only positively correlated with each other but also highly correlated with grain and straw yield of wheat. The correlation matrix revealed that among the different fractions, WSEX-Zn content was highly correlated with AFeOXZn content and the SpAd-Zn content was highly correlated with MnOX-Zn content. The maximum correlation of total Zn content was observed with RES-Zn and AFeOX-Zn. The grain and straw yield of wheat were highly correlated with the SpAd-Zn, SpAd-Fe content followed by MnOX-Zn, CFeOX-Fe, MnOX-Fe contents. Under the periodic release behaviour of DTPA-extractable Zn and Fe content in pearl millet-wheat system, DTPA-extractable Zn content released upto 10 days and thereafter remained almost constant upto 60 days whereas the DTPA-Fe content was releasing upto 30 to 40 days followed by a constant value after 40 days of incubation. Thus, in line with the objectives, the long term application of FYM @ 15 t ha-1 along with nitrogen @120 kg ha-1 in both Kharif and Rabi mode of application sustained the wheat productivity as well as availability of Zn and Fe under the pearl millet-wheat system.