Compost calcium

Choi H, Chung I, Sin MH, Kim YS, Sim J, Kim J, Kim KD, Chun S (2007) The effect of spent mushroom sawdust compost mixes, calcium cyanamide and solarization on basal stem rot of the cactus Hylocereus trigonus caused by Fusarium oxysporum. Crop Prot 26 162-168. doi 10.1016/j.cropro.2006.04.017... 

Mnkeni PNS, MacKenzie AF (1985) Retention of ortho- and polyphosphates in some Quebec soils as affected by added organic residues and calcium carbonate. Can J Soil Sci 65 575-585 Ogaard AF (1996) Effect of fresh and composted cattle manure on phosphorus retention in soil. 

Procedure (extraction). Weigh 10 g air-dry soil sieved to s2 mm (10 mesh) into a 50-ml conical flask. Add 25 ml of calcium phosphate extractant (50 ml for peat or compost) and shake on a reciprocating shaker (at approximately 200-275 oscillations of 25 mm per minute) for 30 min. If the presence of sol-... 

Procedure. Carry out the extraction and then determine phosphorus as in Method 5.9a, except that working standard solutions should be made up in the Mehlich 1 extractant. Determine potassium and magnesium as in Method 5.10, except that standards are made up in Mehlich 1 extractant. Determine calcium as in Method 5.2, except that standards are made up in Mehlich 1 extractant. The composition of composts is so variable that appropriate dilutions of extracts may be required, and calculations adjusted accordingly. 

Schimpf and Petteys (1997) studied the effect of pH and salt concentration on hydrodynamic size of HA, FA, and DOC from compost. They generally found that the hydrodynamic size decreased along with a decrease in pH, but at a pH below 5, HA formed large aggregates. Small amounts of sodium chloride had little effect on the size distribution of HS, whereas calcium chloride reduced the hydrodynamic size of individual molecules inducing the formation of aggregates. 

Brown leaf tips inside the head are caused by calcium deficiency. Many factors contribute to poor calcium uptake. To prevent problems, keep soil moisture constant and side-dress plants with compost to provide balanced nutrition. 

Celery is a heavy feeder. Boron deficiency causes brown, mottled leaves and horizontal cracks on stalks. Florida 683 is tolerant of low boron. Calcium deficiency causes the center of the plant to blacken and die. Utah 52-70R Improved is tolerant of low calcium. Magnesium deficiency causes yellow leaves. Discolored streaks on stalks are a symptom of potassium deficiency. Phosphorus deficiency causes plants to form rosettes. Prevent problems by adding plenty of compost to the soil and by spraying plants with seaweed extract every 2 weeks. Check suspected deficiencies with soil tests and amend soil as needed. 

Various nutrient deficiencies can affect lettuce. Boron or phosphorus deficiency causes malformed plants. Calcium deficiency causes browning of young leaves. Poor heart formation is a symptom of molybdenum deficiency. Copper deficiency prevents heads from forming. Spray seedlings with seaweed extract to help prevent nutrient deficiencies. Continue to spray plants with seaweed extract or compost tea every 2 weeks to boost plant health. Do a soil test to confirm the deficiency, and amend soil accordingly. 

Tomatoes require full sun and deep soil with a pH between 6.0 and 6.8. Work in plenty of compost before planting to add organic matter. Tomatoes require moderate levels of nitrogen and phosphorus, and moderate to high levels of potassium and calcium. Tomatoes grow best between 75° and 90°E Temperatures over 100°F can kill blossoms, while temperatures below 50°F can cause chilling injury. 

Fig. 2 EE-SEM images of PCL and its indicated nanocomposites before and after soil burial (compost). The numbers after the specimen name represent the biodegradation time in days. 0 indicates the sample before biodegradation. Nanoparticles were ion-exchanged with di-methyl di-tallow ammonium (MAE), di-poly oxy ethylene alkyl methyl ammonium (MEE), and calcium phosphate hydroxide [hydroxyapatite (HA)] [29]...

A specially engineered mineral - EMforce Bio calcium carbonate has been found to be very effective for PLA resin reinforcement. At equivalent loading levels, PLA/ EMforce Bio calcium carbonate composites exhibited a imique combination of both superior modulus and impact toughness. Since EMforce Bio calcium carbonate is a calcium carbonate based mineral, the excellent compostability of PLA composites is preserved. 

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