Sudhir Verma | Dr Yashwant Singh Parmar University of Horticulture and Forestry, Solan (original) (raw)

Papers by Sudhir Verma

Research paper thumbnail of Evaluation of Phenological Cycles and Thermal Time of Apple Crop Growing at Different Altitudinal Gradients in North Western Himalayas

International Journal of Economic Plants

Research paper thumbnail of Impact of Climate Change on Mountain Horticulture

Climate-Resilient Horticulture: Adaptation and Mitigation Strategies, 2013

Research paper thumbnail of Changes in soil quality and carbon storage under biofuel crops in central Ohio

Research paper thumbnail of Micronutrient cations status in vegetable growing soils of sub-humid and wet-temperate zones of Himachal Pradesh

Composite surface (0 to 0.15 m) soil samples were collected from vegetable growing fields in mid-... more Composite surface (0 to 0.15 m) soil samples were collected from vegetable growing fields in mid-hills subhumid and high-hills wet-temperate sub-agroclimatic zones of Himachal Pradesh. The soils in wet-temperate zone of Himachal Pradesh were more acidic (pH 5.2 to 6.8) in contrast to soils in mid–hills subhumid zone (pH 5.8 to 7.5), sandy loam to clay loam in texture, medium to high in organic carbon content. Soils were medium in available-N, low to medium in available-P and medium to high in available-K. In sub-humid zone, the DTPA-extractable micronutrients ranged between 0.64 to 11.0 mg kg-1 for Zn, 0.14 to 2.80 mg kg-1 for Cu, 10.6 to 70.8 mg kg-1 for Fe and 2.1 to 34.9 mg kg-1 for Mn, while in wet-temperate zone between 0.44 to 2.06 mg kg-1 for Zn, 0.02 to 3.60 mg kg-1 for Cu, 22.8 to 96.6 mg kg-1 for Fe and 2.5 to 40.0 mg kg-1 for Mn. Soils in some parts of wet temperate zone of Himachal Pradesh are inherently low in DTPA-extractable Zn (19%), Cu (13%) and Mn (6%), while parts...

Research paper thumbnail of Zinc availability in an acid Alfisol as influenced by long term cropping in a wet temperate zone of Western Himalayas

Research paper thumbnail of Effects of boron fertilization on calcium: boron ratio and boron mobility in cauliflower

Research paper thumbnail of Effects of Nitrogen Fertilizers on Soil Air Concentration of N 2 O and Corn Growth in a Greenhouse Study

Journal of Crop Improvement, 2015

ABSTRACT

Research paper thumbnail of Soil Potassium Fractions in Rice-Wheat Cropping System After Twelve Years of Lantana Residue Incorporation in a Northwest Himalayan Acid Alfisol

Journal of Plant Nutrition, 2013

Research paper thumbnail of Phosphorus fractions in an acid soil continuously fertilized with mineral and organic fertilizers

Biology and Fertility of Soils, 2005

Research paper thumbnail of Effect of Long-Term Use of Chemical Fertilizers With and Without Organics on Forms of Soil Acidity, Phosphorus Adsorption and Crop Yields In An Acid Soil

… of the Indian Society of Soil …, 2005

The effect of continuous application of chemical fertilizers with and without farmyard manure (FY... more The effect of continuous application of chemical fertilizers with and without farmyard manure (FYM) and lime on different forms of soil acidity, phosphorus adsorption and crop yields was studied in a long-term field experiment initiated during rabi 1972–73. The imbalanced use ...

Research paper thumbnail of Effect of long-term manuring and fertilizers on carbon pools, soil structure, and sustainability under different cropping systems in wet-temperate zone of northwest Himalayas

Biology and Fertility of Soils, 2007

We investigated C management index (CMI; an indicator of sustainability of a management system an... more We investigated C management index (CMI; an indicator of sustainability of a management system and is based on total and labile C) and soil aggregation in medium-textured soils (silt loam and silty clay loam) under different cropping systems as follows: maize-wheat (M-W), rice-wheat (R-W), soybean-wheat (S-W), Guinea grass, and Setaria grass. Field experiments were 6–32 years long and were located in the wet-temperate zone of northwest Himalayas. The plant nutrients were applied through chemical fertilizers (urea, superphosphate, and muriate of potash) with or without organic materials (FYM, wheat straw, and Lantana spp.). The content of total C (CT), labile C (CL), CMI, mean weight diameter (MWD), and aggregate porosity varied significantly under different cropping systems. The range was 1.59 (R-W)–4.29% (Setaria) for CT, 1.23 (R-W)–3.89 mg/kg (Guinea grass) for CL, 52.09 (R-W)–129.77 (Guinea grass) for CMI, 0.90 (R-W)–5.09 (Guinea grass) for MWD, and 41.5 (R-W)–56.8% (S-W) for aggregate porosity. Aggregate porosity was highest (56.8%) under S-W, followed by grasses (50.1–51.2%), and M/R-W (41.5–50.0%). As per these data, (a) continuous use of N alone as urea lowered soil sustainability over control (no fertilizers); (b) use of NPK at recommended rates improved soil productivity over control; (c) the NPK + organic amendments further improved soil sustainability; and (d) the sustainability under different cropping systems followed the order: perennial grasses > soybean-wheat > maize-wheat > rice-wheat.

Research paper thumbnail of Long-term effects of organics, fertilizers and cropping systems on soil physical productivity evaluated using a single value index (NLWR

Soil & Tillage Research, 2008

Effect of different cropping systems, viz. maize–wheat (M–W), rice–wheat (R–W), soybean–wheat (S–... more Effect of different cropping systems, viz. maize–wheat (M–W), rice–wheat (R–W), soybean–wheat (S–W), and perennial grasses (guinea grass and setaria grass), in vogue since 6–32 years, and long-term use of chemical fertilizers (N, NP, NPK and NPK + lime) and organic materials ( ...

Research paper thumbnail of Evaluation of Phenological Cycles and Thermal Time of Apple Crop Growing at Different Altitudinal Gradients in North Western Himalayas

International Journal of Economic Plants

Research paper thumbnail of Impact of Climate Change on Mountain Horticulture

Climate-Resilient Horticulture: Adaptation and Mitigation Strategies, 2013

Research paper thumbnail of Changes in soil quality and carbon storage under biofuel crops in central Ohio

Research paper thumbnail of Micronutrient cations status in vegetable growing soils of sub-humid and wet-temperate zones of Himachal Pradesh

Composite surface (0 to 0.15 m) soil samples were collected from vegetable growing fields in mid-... more Composite surface (0 to 0.15 m) soil samples were collected from vegetable growing fields in mid-hills subhumid and high-hills wet-temperate sub-agroclimatic zones of Himachal Pradesh. The soils in wet-temperate zone of Himachal Pradesh were more acidic (pH 5.2 to 6.8) in contrast to soils in mid–hills subhumid zone (pH 5.8 to 7.5), sandy loam to clay loam in texture, medium to high in organic carbon content. Soils were medium in available-N, low to medium in available-P and medium to high in available-K. In sub-humid zone, the DTPA-extractable micronutrients ranged between 0.64 to 11.0 mg kg-1 for Zn, 0.14 to 2.80 mg kg-1 for Cu, 10.6 to 70.8 mg kg-1 for Fe and 2.1 to 34.9 mg kg-1 for Mn, while in wet-temperate zone between 0.44 to 2.06 mg kg-1 for Zn, 0.02 to 3.60 mg kg-1 for Cu, 22.8 to 96.6 mg kg-1 for Fe and 2.5 to 40.0 mg kg-1 for Mn. Soils in some parts of wet temperate zone of Himachal Pradesh are inherently low in DTPA-extractable Zn (19%), Cu (13%) and Mn (6%), while parts...

Research paper thumbnail of Zinc availability in an acid Alfisol as influenced by long term cropping in a wet temperate zone of Western Himalayas

Research paper thumbnail of Effects of boron fertilization on calcium: boron ratio and boron mobility in cauliflower

Research paper thumbnail of Effects of Nitrogen Fertilizers on Soil Air Concentration of N 2 O and Corn Growth in a Greenhouse Study

Journal of Crop Improvement, 2015

ABSTRACT

Research paper thumbnail of Soil Potassium Fractions in Rice-Wheat Cropping System After Twelve Years of Lantana Residue Incorporation in a Northwest Himalayan Acid Alfisol

Journal of Plant Nutrition, 2013

Research paper thumbnail of Phosphorus fractions in an acid soil continuously fertilized with mineral and organic fertilizers

Biology and Fertility of Soils, 2005

Research paper thumbnail of Effect of Long-Term Use of Chemical Fertilizers With and Without Organics on Forms of Soil Acidity, Phosphorus Adsorption and Crop Yields In An Acid Soil

… of the Indian Society of Soil …, 2005

The effect of continuous application of chemical fertilizers with and without farmyard manure (FY... more The effect of continuous application of chemical fertilizers with and without farmyard manure (FYM) and lime on different forms of soil acidity, phosphorus adsorption and crop yields was studied in a long-term field experiment initiated during rabi 1972–73. The imbalanced use ...

Research paper thumbnail of Effect of long-term manuring and fertilizers on carbon pools, soil structure, and sustainability under different cropping systems in wet-temperate zone of northwest Himalayas

Biology and Fertility of Soils, 2007

We investigated C management index (CMI; an indicator of sustainability of a management system an... more We investigated C management index (CMI; an indicator of sustainability of a management system and is based on total and labile C) and soil aggregation in medium-textured soils (silt loam and silty clay loam) under different cropping systems as follows: maize-wheat (M-W), rice-wheat (R-W), soybean-wheat (S-W), Guinea grass, and Setaria grass. Field experiments were 6–32 years long and were located in the wet-temperate zone of northwest Himalayas. The plant nutrients were applied through chemical fertilizers (urea, superphosphate, and muriate of potash) with or without organic materials (FYM, wheat straw, and Lantana spp.). The content of total C (CT), labile C (CL), CMI, mean weight diameter (MWD), and aggregate porosity varied significantly under different cropping systems. The range was 1.59 (R-W)–4.29% (Setaria) for CT, 1.23 (R-W)–3.89 mg/kg (Guinea grass) for CL, 52.09 (R-W)–129.77 (Guinea grass) for CMI, 0.90 (R-W)–5.09 (Guinea grass) for MWD, and 41.5 (R-W)–56.8% (S-W) for aggregate porosity. Aggregate porosity was highest (56.8%) under S-W, followed by grasses (50.1–51.2%), and M/R-W (41.5–50.0%). As per these data, (a) continuous use of N alone as urea lowered soil sustainability over control (no fertilizers); (b) use of NPK at recommended rates improved soil productivity over control; (c) the NPK + organic amendments further improved soil sustainability; and (d) the sustainability under different cropping systems followed the order: perennial grasses > soybean-wheat > maize-wheat > rice-wheat.

Research paper thumbnail of Long-term effects of organics, fertilizers and cropping systems on soil physical productivity evaluated using a single value index (NLWR

Soil & Tillage Research, 2008

Effect of different cropping systems, viz. maize–wheat (M–W), rice–wheat (R–W), soybean–wheat (S–... more Effect of different cropping systems, viz. maize–wheat (M–W), rice–wheat (R–W), soybean–wheat (S–W), and perennial grasses (guinea grass and setaria grass), in vogue since 6–32 years, and long-term use of chemical fertilizers (N, NP, NPK and NPK + lime) and organic materials ( ...