Have you ever come across a situation where you have provided proper nutrition and sufficient irrigation to your crop, yet the yields still don’t meet expectation? Well, it’s time to reconsider all the factors that are important for healthy crop yield. Most of the farmers assume they have taken care of all the factors required for good production by taking care of plant nutritional needs such as application of high yielding seeds, proper irrigation and plant protection needs such as pesticides. You might have provided all the nutrition, but is the plant getting this nutrition? If you are feeling confused, this article is just for you.

If the soil is too compact, chances are your crop might not receive nutrition or irrigation you are supplying them. Soil with high bulk density also means low soil porosity. This is referred as density and reflects the soil’s ability to provide functional support such as movement of water and solute and soil aeration. Bulk density beyond certain threshold limit indicates impaired function. High bulk density soil can restrict root growth and movement of air and water through the soil. This will result in shallow plant rooting and poor plant growth leading to poor crop yield and reduction in available vegetative cover that protects soil from erosion.

If the water is not able to infiltrate into the soil, the soil compaction can accelerate the rate of runoff and erosion from sloping land or water logged soils in flatter areas. Under certain circumstances soil compaction is beneficial such as arid condition where soil compaction restricts movement through soil profile. However under humid conditions compaction decreases yield.

There are two main types of soil compaction namely surface and sub-surface. Surface compaction can be elevated using normal tillage operation. Subsurface compaction below the normal tillage depth remains. Breaking subsurface compact soils has resulted in remarkable yield increase in several cases. In many of the cases farmers suspect of ‘subsurface compaction’ in their field but have no idea of measuring it. A diagnostic tool that easily helps a farmer to diagnose subsurface compaction is an soil penetrometer also know a soil compaction meter.  This tool will easily help you determine if subsoiling compaction exists and at what depth. A penetrometer is a 30-degree circular stainless steel cone with a steel shaft and a pressure gauge. The gauge reads in pounds per square inch (psi). To detect soil compaction penetrometer is pushed into the soil at the rate of 2.5cm per sec. Reading between 400 to 500 psi indicates potential soil compaction. Repeat the test ensuring the areas compared have similar soil moisture content.

Deep tillage is only a temporary measure and an expensive one, besides there are plenty of adverse effects of deep tillage while combating subsurface compaction. So it is imperative to conduct a penetrometer test periodically to determine chances of possible soil compaction and take necessary preventive measure to prevent soil compaction. Any practice that naturally improves soil structure and decreases bulk density should be employed.

How hard is it to shoot a clay target in the dark? You can have a stab but the result won’t be ideal. A farm is a business and business decisions need to be based on data/logic so the best outcomes can be achieved.  The farm is a dynamic business where variables change all the time so having access to the latest data reduces this variability.

 

Soil nutrient testing eliminates the guess work and equips you with information that helps in production of healthy plants and thereby ensures maximum yield. The facility for soil nutrient testing is available fairly easily through your local cooperative extension or private laboratories. Soil nutrient testing provides comprehensive and informative test and is available at a low price if used correctly.

 

Routine soil testing is imperative to figure out nutrient deficiencies and surplus, cation exchange capacity (CEC) and soil pH. Soil testing results helps in selecting appropriate fertiliser and amendments to take corrective measure against deficiencies and other problems and thus results in optimisation of uptake of fertilizer nutrients in plants. Optimum nutrient uptake is important as fertilisers claim for sizeable portion of overall crop production expenses.

 

Soil nutrient testing is going to help you for below three reasons

• Present Status: It lets you know the status of your soil fertility and nutrient requirement.
• Corrective measures: It helps you evaluate the suitability of the current management practice over time, requirement for adjustment of existing fertilizer program and helps in ensuring optimum yield.
• Diagnostic: It helps you know the exact reason for poor yield or poor growth. The test will also show if there is an accumulation of mineral elements that are toxic to plant.

 

The best time to take soil sample

• Before you start land preparation
• After harvesting
• Whenever there is an outbreak of insects or diseases
• Whenever you have a doubt about the amount of fertilizer required
• Whenever you prepare batch of potting mixture

 

Once a farmer has a fair idea of the current nutrient status of the soil and therefore can plan more efficiently future strategies. This knowledge will also inform if any ameliorants are required to correct the soil’s physical or chemical imbalances. Not only does soil testing helps in taking corrective measures but also helps in identifying opportunities to improve farm productivity through efficient soil fertility management. A farmer can also design an appropriate nutrient plan based on certain productivity targets.  Monitoring soil nutrient status over time will help farmer identify patterns that can help build long term strategies besides helping him fine-tune inputs. The best of all, soil testing will help a farmer realise improved budgeting of farm financial resources through efficient cost effective nutrient decision.

Humic acid and fulvic acid, also commonly referred to as “black gold of agriculture”, as they are a major component of organic matter and play an important role in soil fertility and plant nutrition. Plants grown on soil with adequate humate acid and fulvic acid face less stress and grow healthier and produce higher yield. Moreover foods grown on soil rich in humic/fulvic acid produce superior quality food and feeds.

There has been much hype about N P K fertilizers in agricultural communities from the time it is discovered that they stimulate plant growth. Prolonged use of these acidic fertilisers in the absence of adequate humic substance in the soil can result in serious sustainablility problems. Scientist and farmers are realising the need to reconsider their approach towards the use of fertilisation techniques that will place more priority on soil humus. The sense of urgency today in emphasising the importance of humic substances and their value as a fertilizer ingredient was never been seen before. Increasingly soil scientist and agronomist are recognising the importance of humic substance in healthy and fertile soil.

Humus is a brown to black complex variable of carbon containing compounds. Humic substances are component of humus and are high molecular weight compounds. They give the soil the structure, porosity, anion exchange, water holding capacity and cation. They also play an active role in chelation of mineral elements. Naturally occurring humic acid (HAs) readily forms a salt with inorganic trace mineral elements. There are over 60 different mineral elements bond to humic acid in a form that can be readily utilised by various living organisms. This helps humic acid function as an important ion exchange and chelating system. Uptake of major plant nutrients that is N, P and K is mediated by humic substances. Studies have shown that adequate presence of humic substance results in reduced requirement for N, P and K fertilizers.

Fulvic acids on the other hand are relatively smaller than humic acid and are mixture of weak aliphatic and aromatic organic acids readily soluble in water. Fulvates acids have twice oxygen content of humic acids and hence they are more chemically reactive. Because of the relatively smaller size of fulvic they can readily enter plant root, stem and leaves. This enables them to carry and transport trace minerals to plant tissues.

Humic substances commonly occur within soil water and compost etc. Most of the soil and water contains some humic substance. Over past several years, the concentration of humic substance in agricultural soil has reached low levels.

Solution: Purchasing fulvic acid and humic acid will never supply even a small percentage of the amount required so are a waste of money. They are also extremely expensive and often sold by snake oil salesman. Humic substance forms naturally if soil is managed properly by adopting certain production practices such as crop rotation, use of a balanced fertilisation program, growing legumes, using green manures, increased use of compost application (contains 60% humic acid and 20% fulvic acid (by dry weight), minimum tillage practice, etc are the only real honest ways to increase these important compounds in the soil. 

Global population is anticipated to grow to reach over 9 billion by 2050. This means the agricultural production needs to increase by 70% at least to meets its growing food demands to feed the entire population. There is a limit to agricultural land and de-forestation is no more a viable option while excess use of fertilisers and pesticides have heavily polluted the land and gave rise to serious sociological and ecological problems. It is imperative that farmers now harness the power of sustainable agriculture for the sake of ecology, instead of only focusing on economic viability of the crop.

 

Sustainable agriculture is the way forward and offers farmers the way to transform their farms into giant recycling centres. It enables farmers to turn crop waste and animal manure into fertilisers. It not only does save them money but it also helps them conserve natural resources. Sustainable production also reduces the requirement for chemical and pesticides use, making the transition to organic and clean farming process much smoother and feasible.  We list down few things that you can easily do on your farm to turn your farming into sustainable one.

 

Crop Rotation

It is one of the oldest and the simplest of all the methods to maintain the health of the soil. Crop rotation has a logical order and if followed properly, crop grown today will help replenish the nutrients that got depleted from the soil by previous crops. For example like planting grains after legumes or row crops after grains or planting barley after wheat to maintain the soil fertility while reducing soil erosion and weather damage. Besides maintaining soil fertility, crop rotation prevents transmission of disease and pest.

 

Crop Diversity

Crop diversity helps farmer protect their crop against pest and disease. Crop diversity can also be done by planting crop variation of the same species. Variations are good to ensure genetic diversity making crops stronger in return. Unfortunately crop diversity is on decline for past few decades.

 

Cover Crop

This is another natural way to fight insect while at the same time enhancing soil quality, fertility and water conservation. Many cover crops have no direct economic value. They are planted around edible crops. Clover is one such example of cover crop which protects soils during winter, filters water and suppresses weeds. Cover crops are also good way to replenish organic matter and promote good soil microorganisms.

 

Integrated Pest Management

This implies the use of various techniques to create an effective pest control system. The first step in the process involves identification of pest, since not pest all needs to be eliminated. Many pest don’t cause major damage and so it’s not a very clever idea to start a full fledge war against them. Leaving them would make better financial sense. Pests can also be prevented using pest resistant crops, crop rotation and using beneficial insects. IPM also makes use of specialised chemicals to fight insects and pests that targeted towards specific pests and not the beneficial insects or wildlife.

 

Soil Fertility

Some of the techniques farmers can employ to improve soil health includes soil tillage. In this practice farmers plough their fields and turn them to aid airing of the soil. Farmers can also leave some crop residue on the ground before they till to enhance the richness of the soil. One of the natural ways in which many farmers around the world are increasing their soil fertility is by adding organic matter such as manure or cover crops.

 

If you want to learn more about sustainable agriculture why not take our world renowned Certificate in Sustaianble Agriculture Course. Once completeing the course you get a certificate to place on your wall.

Michael Pollan (famous for The Omnivore’s Dilemma book) takes us on a exploration of the human relationship with the plant world, seen from the plants’ point of view.

Need a quick 10 minute full body workout give this a try. Thanks Lisa for making this for BioStim readers.