Kisanmanch | Soil Testing
Why shall you conduct Leaf test:

As a grower you might have felt as why the plant produce / yield is not up to the mark despite using best quality & branded fertilizers and other nutrient supplements even while following all does and don’t?. Most the time we over fertilize our filed and crops which not only damage our soil quality but also hamper the plant growth and yield. Remember, More fertilizer will never result in more productivity whereas it effects negatively. It destroys your Crop &Soil, inbuilt Chemical Residue in your farm produce, hamper public health and effects negatively on Indian export image. India’s is world’s leading farm produce producers in many categories but do not export much because our exports commodities do not match European health standard because of high chemical residue. You might have heard many times as Indian Mango consignments get rejected by many foreign countries. So how do we go ahead? Please understand as what are the effects of many high soil nutrients For example: If we have High phosphorus in our filed it will stop uptake of Iron, Zinc & Manganese. High Calcium will stop uptake of Potassium, Boron & Magnesium, High Potassium will stop uptake of Magnesium, Calcium & Nitrogen. High Magnesium will stop uptake of Calcium. High Manganesewill stop uptake of Zinc. High Zinc, Manganese& Copper will stop uptake of iron. Each nutrient quantity in your farm soil effects negatively if high, will effect positively if it is balanced. So do you keep a track on balanced Nutrient Supply in your farms is that you conduct Soil Test after every harvest in order to understand as how much nutrients have been removed by the crop while producing total yield Kg/Hac.. This is the first Criteria to understand balanced nutrients calculation for the next crop/ season. on the below link you can check the total nutrient removal on our portal and apps. As a second criteria please take a soil sample and make a request for Soil Testing and understand the actual nutrient availability remaining in your soil . Considering these two criteria you can plan your nutrient quantity for the next crop & season. Once you have followed these metrics and applied fertilizers according to this method, You may still found some deficiencies in your crop/plant and you may not get the expected yield. Here comes the leaf Testing into picture as this may help you to analyze the status of nutrient uptake by your plants/crops and manage foliar applications of various nutrients. Most of farmer/grower uses Foliar Application of Water Soluble Fertilizers unnecessary which create over dosage and toxicity in the crops and plants. It also adds to an increase in our crop cultivation cost. So it is better to conduct Leaf Test always before applying any nutrients.

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Plant sampling guidelines for selected field, vegetable and fruit crops

Crop Sampling Time Plant Part Sample Number
Corn Before tasseling Fully mature leaf from top of plant 15 - 25
Sorghum Before Heading Fully mature leaf from top of plant 15 - 25
Wheat,Barley Before Heading Uppermost leaf blades 25 - 40
Soyabean Bear Bloom Young nature Leaf 20 - 30
Canola/Rapeseed Stem Elongation Fully mature leaf from top of plant 50 - 60
Rice Panicle initiation Most recent leaf 25
Cabbage Before or at heading Young wrapper leaf 10 - 20
Onion Whole shoot 15 - 25
Potato Early bloom Young mature leaf 25 - 30
Tomato Early bloom Leaf from growing tip 15 - 25
Beans Before or at bloom Young mature leaf 20 - 30
Peppers Midseason Young mature leaf 25 - 50
Root Crops Before root or bulb enlargement Young mature leaf 25 - 35
Alfalfa Early Bloom Upper 1/3 of plant 20 - 30
Apple, Plum, Apricot,
Cherry, Almond
Midseason Leaves from non-fruting spurs 50 - 100
Grapes At bloom petioles or leaves adjacent to 50 - 100

How does Leaf Help the Plant/Crop: The leaf of a plant is used for the production of oxygen through photosynthesis. The chlorophyll in the plants draws in carbon dioxide (CO2) and releases oxygen, throughout this process the substance glucose is formed which is the sugars used by plants to grow, it is the energy they use. The leaf has main two functions 1. Photosynthesis : which synthesis food in the form of glucose in presence of sunlight and carbon dioxide with the help of green pigment chlorophyll which is present in the chloroplasts of the leaves. 2. Transpiration : The release of water through stomata and control the temperature of the plant by evaporation of this water (just like in human beings). In addition to this there are some functions that are performed by the leaves with the help of structural modifications in the leaves. Some plants have colourful leaves (e.g. Coleus) which attract the insect for the pollination. Some leaves like Bryophyllum have marginal buds which can produce new plants.