1. Peranan & Defisiensi K Tanaman Tomat
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

2. Peranan & Defisiensi K dalam Tomat
Pendahuluan
Potassium is used in carbohydrate metabolism and increases water-use efficiency
It is essential for protein synthesis and activates enzymes and controls their reaction rates
It promotes flower and fruit production and is vital for maintaining growth and helping plants resist diseases
K management should be considered part of long-term soil fertility management because K is not easily lost from or added to the root zone
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

3. Peranan & Defisiensi K dalam Tomat
Peranan K dalam Tanaman Tomat
Involved in osmoregulation and enzyme activation
Regulates transpiration by stomata and transport of assimilates
Increases leaf area and chlorophyll content
Delays leaf senescence and thus contributes to greater canopy photosynthesis and crop growth
Improves the plant’s tolerance of adverse climatic conditions, lodging, insect pests, and diseases. 
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

4. Role and Deficiency Symptoms of Potassium in Tomato
Sources of potassium
Chemical fertilizers
Potassium chloride (Muriate of potash) (50% K)
Potassium nitrate (37% K, 13% N )
Potassium sulfate (40–43% K, 18% S)
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

5. Role and Deficiency Symptoms of Potassium in Tomato
K deficiency symptoms
Woody stems and slow growth. Stems become weak and fall down
Leaves are blue-green in color and the interveinal area often fade to a pale grey color
Leaves may also have a bronzed appearance and yellow and orange patches may develop on some of the leaflets
Fruits often ripen unevenly and sometimes have green patches near the stalks
Older leaves may look scorched around the edges and/or wilted. Symptoms first appear on older leaves
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

6. Peranan & Defisiensi K dalam Tomat
Gejala defisiensi K pada daun
Source:
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

7. Peranan & Defisiensi K dalam Tomat
Defisiensi K buah tomat
Source:
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

8. Peranan & Defisiensi K dalam Tomat
Sebab-sebab Defisiensi K
Lower K-supplying capacity of soil
Low recovery efficiency of applied K fertilizers because of high K-fixation capacity of soil or leaching losses
Complete removal of previous crop straw/ residues
Wide Na:K, Mg:K, or Ca:K ratios in soil and sodic/saline conditions.
Presence of excessive amounts of reduced substances in poorly drained soils (e.g., H2S, organic acids, Fe2+) causing retarded root growth and hence K uptake.
Imbalanced fertilization especially excessive use of N or N and P fertilizers with insufficient K application.
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎

9. Peranan & Defisiensi K tanaman tomat
Potassium is used in starch and sugar synthesis so is more important in vegetables and fruits
Potassium is naturally found in wood ash
Prevention and cure can be achieved in short term by adding potassium-specific fertilizer called potash
Adequate moisture is necessary for effective potassium uptake; low soil water reduces K uptake by plant roots
Limiting acidic soils also increase K retention in the soil by reducing leaching
SUMBER: agropedialabs.iitk.ac.in/agrilore/sites/.../potassium%20in%20tomato_1.pp...‎