Stability of yield and its attributes were assessed for nineteen genotypes over twelve environments

The experimental design was randomized complete block design (RCBD) with three replications. The treatments were (1) Nonfertilization, (2). Control treatment (120, 45, 25 kg/fed NPK), (3). Humic acid+ 100% NPK, (4). Potassin +100% NPK, (5) Calfruit + 100% NPK, (6) Humic acid+ Potassin +100% NPK, (7) Humic acid+ Calfruit + 100% NPK, (8) Potassin + Calfruit + 100% NPK, ( 9) Humic acid+ Potassin + Calfruit, (10). Humic acid+ Potassin + Calfruit + 25% NPK, (11) Humic acid+ Potassin + Calfruit + 50% NPK (12) Humic acid+ Potassin + Calfruit + 75% NPK. Application of Pot.+Cal.+HA+75%NPK, produced the highest values of plant height at 90 and 120 DAT in both seasons and plant dry weight, bulb dry weight at 120 DAT in both seasons. While, Non-fertilization treatment gave the lowest values of plant height, bulb diameter, fresh plant weight, leaves fresh weight, bulb fresh weight, plant dry weight, leaves dry weigh, bulb dry weigh at 90 and 120 DAT and number of days to maturity in the two seasons. Generally, treatment of Pot.+Cal.+HA+75% NPK attained the highest values of total bulbs yield, bulb diameter, TSS%, D.M% in both seasons.

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This work was performed at the Experimental Farm of the Faculty of Agriculture Assiut Univ. during two fall seasons (1995–1996 and 1996–1997) to study the effect of planting date, cultivar, and seed cutting on the growth and yield of potato. A factorial experiment was designed. All data was subjected to statistical analysis. The results indicate that there is a significant effect for all the studied factors on the growth and yield of potato. The data also indicate that planting on 1 Oct. or 1 Nov. showed higher emergence percentage, total yield, final plant stand, rate of emergence, and height and number of stems. `Spunta' produced the highest stem length, fresh weight per plant, and total yield. Whole tubers gave higher stem length, plant fresh weight, tuber weight, and tuber number per hill.

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