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AGRON 111 Practical 08: Seed-rate and plant-population calculations | बीज दर और पौध संख्या गणना

AGRON 111 • PRACTICAL 08 • HINDI + ENGLISH

Seed-rate and plant-population calculations

बीज दर और पौध संख्या गणना

B.Sc. Agriculture • Fundamentals of Agronomy

In this lecture / इस पाठ में

  1. Population formula | पौध संख्या सूत्र
  2. Seed number and mass | बीज संख्या व भार
  3. Worked example | हल
  4. Plot conversion and checks | plot रूपांतरण व जाँच

Population formula | पौध संख्या सूत्र

English

For regular rows, population/ha=10000×plants per hill/(row spacing m×hill spacing m). Example0.30m×0.10m with one established plant per hill gives333333plants/ha approximately. Convert centimetres to metres first. Hills, seeds placed and surviving plants are different quantities.

हिन्दी

नियमित कतार में पौध/ha=10000×पौध/स्थान÷(कतारm×स्थानm)।0.30×0.10m पर एक पौध सेलगभग333333/ha।cm पहलेm करें।स्थान,डाले बीज और जीवित पौध अलग हैं।

Seed number and mass | बीज संख्या व भार

English

If target plants=N and pure-seed germinationG and subsequent establishmentE are separate fractions, pure seed required=N/(G×E). With physical purityP, bulk seed count equivalent=N/(P×G×E), subject to the seed-lot interpretation. Mass kg=seed number×thousand-seed weight g/1000000. Do not double-count germination if E already includes it.

हिन्दी

लक्ष्यN,अंकुरणG और उसके बाद स्थापनाE अलग अंश हों तो pure बीज=N/(G×E)।भौतिक शुद्धताP पर bulk equivalent=N/(P×G×E)।भारkg=बीज संख्या×हजार बीज भारg/1000000।E में germination शामिल हो तो दोहरा सुधार नहीं।

Worked example | हल

English

Illustrative target200000plants/ha, P0.98,G0.90,E0.85 and thousand-seed weight40g: bulk seed equivalent=200000/(0.98×0.90×0.85)=266773 approximately; mass=10.67kg/ha. This arithmetic is not a recommended crop seed rate. Actual seed size distribution, tillering, sowing losses and local recommendations matter.

हिन्दी

लक्ष्य200000,P0.98,G0.90,E0.85,हजार बीज40g परलगभग266773बीज equivalent और10.67kg/ha।यह crop recommendation नहीं।वास्तविक आकार,tillering,बुवाई हानि,स्थानीय सिफारिश महत्वपूर्ण हैं।

Plot conversion and checks | plot रूपांतरण व जाँच

English

For a100m² plot, seed mass=(kg/ha)×100/10000;10.67kg/ha requires0.1067kg, about106.7g. Record all input values, whether losses overlap, formula, units and rounding. Check that increasing expected losses increases required seed, not decreases it.

हिन्दी

100m² के लिएkg/ha×100/10000;10.67से0.1067kgलगभग106.7g।सभी input,loss overlap,सूत्र,इकाई,rounding लिखें।हानि बढ़े तो जरूरत बढ़नी चाहिए।

Practice / Record | अभ्यास / रिकॉर्ड

Percentages90% and85% enter the denominator as0.90 and0.85, not90 and85.

90%,85% को0.90,0.85 रखें,90,85 नहीं।

Self-check & viva | स्वयं जाँच

Try answering before opening the answer. / पहले स्वयं उत्तर दें।

1ha equals? | क्षेत्र?

10000m². |10000वर्गm।

Why distinguish plants and seeds? | क्यों?

Not every seed becomes an established plant. | हर बीज पौधा स्थापित नहीं करता।

Exam answer plan: define the term, explain the mechanism, add a labelled diagram or calculation where relevant, state assumptions and limitations. / उत्तर क्रम: परिभाषा, क्रियाविधि, उपयुक्त चित्र/गणना, शर्तें और सीमाएँ।

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