Naveen Kalra

14 Questions 73 Answers 0 Followers

Questions related from Naveen Kalra

I am interested in simple model for net primary productivity assessment for tropical/sub-tropical regions, in particular for north-west himalayas?

Net primary productivity, although available through satellite images and are commonly employed, but the validation with few of the case studies lacking. There is a need to evolve simple models...

25 March 2017 7,710 2 View

Dear researchers colleagues, is there any review of water use efficiency (ET based/consumptive/conjunctive) of crops/cropping systems?

Water use efficiency is not conservative, as it varies under differential inputs as well biotic/abiotic stresses, but normally we describe WUE under potentially grown condition, in a way to assess...

02 February 2016 5,319 16 View

Dear Researchers colleagues, is there any compilation from the group for radiation use efficiency of various imp crops?

radiation use efficiency (expressed in terms of solar radiation, intercepted solar radiation, PAR, intercepted PAR) for potentially grown condition, as well under various biotic/abiotic stress is...

02 February 2016 8,066 1 View

Is there any empirical relation to deduce mineral N in the soil layer on the basis of Available nitrogen?

Mineral N (nitrate and ammonical form) is highly dynamic, and is generally not measured by most of the researchers, who most of the time take total N or available N in consideration for evaluating...

29 January 2016 7,069 5 View

Several soil quality indices reported in literature, but effective operational soil health service missing. Please suggest the ways.

1. Lot of information on soil test values (spatio-temporal)) available 2. Soil quality indices e.g. SQI by Ratan Lal et al, Cornell soil health index, STCR network ar Indian Institute of Soil...

22 January 2016 8,641 26 View

PH greatly influence nutrients' availability, is multi-nutrients interaction quantified, which lacks in most of crop models to address problem soils?

Even if crop models have N or NPK interaction, pH greatly influence nutrients' availability, in particular micro-nutrients, which may reduce the yield even under adequate NPK supply, we need to...

21 January 2016 3,666 8 View

How the photosynthetic efficiency of crops differs between direct and diffused solar radiaion?

Due to enhanced pollution/increased aerosol concentration, the modifications in direct/diffused components of solar radiation takes place. Under extreme climatic events occurrence, reduction in...

21 January 2016 3,182 4 View

Any decision support tool or model for secondary and micro-nutrients optimization for a target yield of crop?

Present day concerns are reporting of micro-nutrients and secondary nutrients deficiencies reported, non-replenishment of most of the micro-nutrients, imbalanced use of secondary and...

01 January 1970 9,453 3 View

Why agri-knowledge dissemination, specially in developing nations, is relatively weak? What are the appropriate solutions?

Few aspects: pre- sown, mid course and post-harvest advisories, soil health service, water and nutrients management, general package of practices, problem soils remedies, insects-pests...

01 January 1970 5,529 11 View

Reviews/databases on Crop water use for rice under lowland / upland rice?

Water use measurements for rice, specifically under lowland /flooded/ submerged condition, are difficult. Terms like reference evapo-transpiration, consumptive water use, actual ET, crop...

01 January 1970 9,938 6 View

Is there any approach to indicate soil biological health on the basis of easily determinable soil parameters?

Several soil quality indices reported in literature, most of them are non-operational on regional applications and confined to basic research platform. Soil biological health is generally...

01 January 1970 4,828 10 View

Are there simple soil quality index calculators used for soil health assessment on operational basis?

Soil health assessment to be used for irrigation/nutrients management, tillage options, identification of suitable resource conservation technologies Soil health assessment in terms of soil...

01 January 1970 7,310 6 View

Any study related to soil fertility beneath forest covers, in particular for north-west himalayas?

How the short and long term changes in the soil fertility developing in the forest ecologies, in particular secondary and micro-nutrients. regards

01 January 1970 4,379 5 View

Can my colleague scientists provide information related to characterization of soils beneath forest trees, in particular for north-west himalyas ?

The comparison of soil characters beneath the forest trees as compared to norman agricultural soils in the nearby region? Short and long term changes in the soil properties beneatrh the forest...

01 January 1970 9,968 4 View