The ___________ is the largest reservoir for nitrogen

The atmosphere holds _______% of all N2 nitrogen

The process where N2 molecules in the air break apart and combine with other atoms to form ammonia

This type of nitrogen fixation occurs when energy from lightning breaks N2 molecules apart and they combine with oxygen forming N2O.

In industrial fixation, N2 combines with with H2 to form______.

When animals at the top of a food pyramid consume plants for their proteins, it is called ______

Bacteria that live in deep, damp sediments provides the service of ________ to return nitrogen to the atmosphere

The decay process includes _______

Most nitrogen fixation happens by ___________________

Bacteria that lives in the roots of plants and fixes bacteria is an example of ______________________

When bacteria in the ground combine with ammonia and oxygen ________ are formed

Nitrates formed by bacteria combining ammonia, oxygen, and nitrogen are part of the ______________ process

When green plants absorb nitrates, and consumers eat the green plants.

Another example of the assimilation process is _____________

Cause: Man makes synthetic (non natural) fertilizers full of nitrogen. Effect: This fixes (creates) more nitrogen than ALL of the natural sources combined.

What are the causes and effects of human impact on the nitrogen cycle?

Acid Rain, Invasion by non-native plants, Fish-kill events, Algal blooms, Changes in species

Consequences of excess N2 nitrogen in the nitrogen cycle are:

Nitrogen Practice | Quizalize

Peas  Peas are one of the most important vegetables Zimbabweans can grow for export.  They are legumes  Legumes fix Nitrogen  IMPORTANCE OF PEAS  Peas have a lot of health benefits for human consumption.  They can be eaten raw or added to a variety of dishes  Peas have vitamins and antioxidants.  They are good for heart performance.  They are good for dealing with high blood pressure.  They have a very high protein content VARIETIES  Some of the common varieties to grow are Snowbird, Sabre, Serge, Alaska, Greenfeast and Recruit  Varieties are also called cultivars FAVOURABLE CLIMATE  Peas prefer cold conditions to grow well.  Temperatures of 22 degrees or below (starting at 13 degrees Celsius) are the best for peas farming.  The best temperature is 22 degrees Celsius.  Extremely hot temperatures will lead to lack of growth or hard pods. SOIL REQUIREMENTS  Soil should be fertile.  The soil should have good drainage.  Soil pH must be in the range of 6 to 7.5.  The best soil type is sandy loam – clay soils can also cut it  The soil should be deep LAND PREPARATION  Land preparation includes the following  Dig or plough to aerate the soil and improve drainage  Harrow to break the clods (big lumps)  Make ridges to keep water within the bed  level the bed to ensure equal water distribution SOWING AND PLANTING  Seeds must be sown about 2 to 3 centimeters into the ground  The germination process takes place within at most 1 week.  When sowing seeds, the in-row spacing should be 5 – 10 centimeters whereas the inter-row spacing should be 25 centimeters. Management Practices  Watering is necessary but does not overdo it – water depending on the state of the pea plants.  Generally, peas do not require lots of water.  WEEDING - Weeding should be done occasionally as informed by the state of the field.  MULCHING – to conserve soil moisture  PEST CONTROL – to protect crops from damage  DISEASE CONTROL – to protect crops from damage  TRELLISING – to support indeterminate varieties PEST, DISEASE AND WEED CONTROL  Aphids, beetles, leaf weevils, nematodes, and leaf miners are some of the common pests to look out for.  Powdery and Downey mildew, fusarium wilt are some of the common diseases to look out for.  As much as you can use chemical methods to deal with pests, diseases and weeds you can still use biological and cultural control methods.  Most of the pests and diseases that affect peas can be dealt with by usingcultural methods like weed control.  getting rid of affected plants and plant debris can control pest and diseases control.

Nitrogen

Nitrogen cycle

Nitrogen fixation

Nitrogen, Phosphorus and Potassium uses

N4 Nitrogen cycle, Fertilizers and affect on biodiversity

Carbon Nitrogen Cycle

Actual nitrogen

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