I= USE OF TRUE POTATO SEED FOR BETTER YIELDS
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Title of Thesis
USE OF TRUE POTATO SEED FOR BETTER YIELDS

Author(s)
Khalid Farooq
Institute/University/Department Details
University of Arid Agriculture, Rawalpindi, Pakistan./ Department of Agronomy
Session
2005
Subject
Agronomy
Number of Pages
356
Keywords (Extracted from title, table of contents and abstract of thesis)
Potato, True potato seed (TPS), MF-1xTPS-67, TPS-7xTPS-67, MF-1 x TPS-13, MF-11 xTPS-67

Abstract
Potato seed being bulk commodity faces quality, availability, transportation and storage problems in Pakistan. True potato seed (TPS) being low-cost planting material can reduce production, storage and transport cost also with limited disease transmission. Nine TPS hybrid families were compared with variety Diamant during two autumn and spring seasons at National Agricultural Research Centre, Islamabad in nursery and field. Nursery management trials; substrate, hilling, planting time and geometry for maximum tuber production were also compared for maximum benefit.

Amongst the TPS hybrid families, the performance of MF-1xTPS-67, TPS-7xTPS-67, MF-1 x TPS-13 and MF-11 xTPS-67 was better in autumn seasons than spring seasons by producing >500 and >300 tubers m-2 respectively in nursery evaluation. These families were also superior for plant vigor, plant height, leaves per plant, leaf area index, plant dry weight, crop growth rate, tuber yield m-2 and average tuber weight.

Amongst the PTS hybrid families, the performance of MF-1 x TPS-67, TPS-7 x TPS-67, MF-1 x TPS-13 and MF-11 x TPS-67 was better in autumn season than spring seasons by producing >500 and >300 tubers m-2 respectively in nursery evaluation. These families were also superior for plant vigor, plant height, leaves per plant, leaf area index, plant dry weight, crop growth rate, tuber yield m-2 and average tuber weight.

The same TPS families confirmed to be better than other families and standard variety Diamant under field conditions for two autumns. These TPS families were found significantly better for plant height, leaves per plant, number of stems m-2, leaf area, leaf area index, plant dry weight, crop growth rate and number of large (>55mm) and medium size (35 to 55mm) tubers m-2 resulting in higher yield. The yields of these four families were significantly higher (25.23, 24.75, 25.62 and 23.84 t/ha respectively) than other families, The percentage of marketable yield was higher in TPS families than that of control veriety Diamant.

Seed being the most expensive input in potato cultivation, was significantly (2-3 times) less required in all the TPS families thus reducing cost of production and increasing net benefit. Cost benefit ratio was higher in TPS families thus reducing cost of production and increasing net benefit. Cost benefit ratio was higher in TPS families and net income from high yielding TPS families was three times higher than variety Diamant.

Different substrate and hilling after germination increased the tuber number and average tuber weight. The substrate composed of soil, sand and farmyard manure in 1:1:1 ratio produced significantly higher tuber number and tuber yield per unit area as compared to loam soil and mixture of soil and FYM. Hilling also the average tuber weight and 12cm hilling in three installments, 4cm each, gave significantly better results.

Planting time and planting geometry affected number of tubers significantly. October planting produced maximum tubers m-2 than September planting. Maximum average tuber weight was higher in September planting. Planting geometry of 25x4cm was the best fro seedling tuber production in nursery beds.

Regarding planting materials; seedling tubers and seed tubers produced higher number and weight of tubers and better yield while transplanted seedlings produced very small tubers and gave the lowest yield. The transplanting during autumn season was not successful that may be due to short growing period and early frost incidence during the month of December. Number of tubers per plant was higher in seedling tubers and seed tubers of TPS families as compared to seed tubers of Diamant variety. Seed tubers of TPS families produced higher percentage of medium of large size tuber than that of Diamant variety. The economic benefit was significantly higher from TPS families in seedling tubers and seed tubers over Diamnat (seed tubers) and transplanting of TPS seedlings.

The use of seedling tubers for commercial potato production brings the maximum net profit and highest cost benefit ratio making it the most liked planting materials and showed better potential for adoption of TPS technology for potato production in Pakistan. The dissemination of this technology at mass scale is needed to harvest the benefits.

Download Full Thesis
3271.85 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
166.91 KB
2 1 Introduction 03
47.59 KB
3 2 Review of Literature 07
308.56 KB
  2.1 Potato Production in Pakistan 07
  2.2 History of Use of True Potato Seed 08
  2.3 TPS technology 10
  2.4 Direct Field Sowing 13
  2.5 Transplanting Seedlings 15
  2.6 Seedling Tuber Production in Nursery Beds and Use as Planting Material 17
  2.7 Nursery Management and Cultural Practices 21
  2.8 TPS Open Pollinated (OP) Families 24
  2.9 TPS Hybrid Families Evaluation 25
  2.10 Growth Analysis 32
  2.11 Economics 34
4 3 Materials and Methods 36
114.39 KB
  3.1 TPS Hybrid Families Evaluation in Nursery 36
  3.2 Comparative Yield Potential of Seedling Tubers of TPS Hybrid Families in Field 41
  3.3 Seedling Time and Geometry 43
  3.4 Seedling Tuber Production as Influenced by Substrates and Hilling Operations in Nursery Beds 44
  3.5 Evaluation of Planting Material 45
  3.6 Economic Analysis 47
5 4 Result and Discussion 48
2029.6 KB
  4.0 Experiments Conducted 48
  4.1 TPS Hyberid Families Evaluation in Nursery 51
  4.2 TPS Hybrid Families Evaluation in Field 98
  4.3 Planting Time and Geometry 125
  4.4 Seedling Tuber Production as Influenced by Substrates and Hilling Operation in Nursery Beds 174
  4.5 Planting Material Evaluation 214
6 5 General Discussion 249
186.54 KB
7 6 Summary 267
85.58 KB
8 7 Literature Cited 275
323.28 KB
9 8 Appendices 315
433.19 KB